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Chapter 12 Electricity - NCERT Solutions for Class 10 Physics CBSE - TopperLearning

Some of the topics on which you will be introduced to are electrostatics, magnetism, ray and wave optics, and modern physics although the concepts of 11th class will be needed to solve some questions. Hence it is advisable to revise the previous class by solving a few questions.

Latest : NEET exam preparation bothering you? Know More. Latest ncert solutions class 10th physics chapter 12 solution Why settle for a classroom full of children when you can have your own personalized classroom?

NCERT book for class 12 physics is divided into two parts. At the end of each chapter, there are exercise questions. You will get NCERT solutions class 12 physics which are prepared in a very comprehensive manner by respective subject experts. After ncert solutions class 10th physics chapter 12 solution the chapter of NCERT physics for class 12 you must try to solve the questions given at the end of the chapter to test how much you have understood from the chapter.

These additional exercises will check your concepts. You can access all the free NCERT solutions for class 12 by clicking on the chapter name for which you want the solutions. The table for chapter pages is provided. Chapter 1 Electric Charges And Fields: You must have seen a spark or have heard a crackle when you take off your synthetic or woollen clothes mainly in dry weather.

Do you know why this happens? Well, this happens due to the discharge of electric charges from our body or in scientific words, this happens due to the generation of static electricity. The first chapter of NCERT class 12 talks about the charges at rest, their properties, the force experienced by a charge and the electric field due to different system of charges.

This chapter has 24 questions and 10 additional questions ncert solutions class 10th physics chapter 12 solution a total of 34 questions. You will find the ncert solutions class 11 physics. This chapter has mainly two concepts that are the potential due to charges and capacitance.

If you remember concepts of mechanics then you can relate the concepts of this chapter to mechanics, like potential energy is equivalent to electric potential energy, the mechanical dipole is equivalent to the electric dipole. This chapter has 11 questions and 26 additional questions, hence a total of 37 questions. Chapter 3 Current Electricity: Chapter 3 of class 12 physics has 13 questions and 11 additional questions and you will find NCERT solutions for class 12 physics chapter 3.

The chapter also introduces the concept of certain measuring instruments like Wheatstone bridge, potentiometer, ammeter, and voltmeter. Chapter 4 Moving Charges And Magnetism: The moving charge under a magnetic field can produce a force. This NCERT class 12 chapter 4 talks about moving current-carrying conductors in a magnetic field and about the magnetic effects produced by these conductors.

You will basically find how a charged particle or current-carrying wire behaves in the presence of a magnetic field. You will also get to know how can current produce a magnetic field. The chapter has 13 questions and 15 additional questions.

Click on the link above to get the solutions. Chapter 5 Magnetism And Matter: This chapter talks about earth's magnetism and magnetic materials and their properties. The earth behaves as a magnet with a magnetic field pointing from south to north. This chapter also tells about the ncert solutions class 10th physics chapter 12 solution of bar magnets. The chapter has 15 questions and 10 additional questions.

You can also download solutions for offline ncert solutions class 10th physics chapter 12 solution. Chapter 6 Electromagnetic Induction: In NCERT class 12 physics chapter 4 it is mentioned that a current-carrying conductor in a magnetic field can produce a force. Whereas in the chapter Electromagnetic Induction we study about a moving conductor in a magnetic field that can produce a current. The chapter has a total of 17 questions out ncert solutions class 10th physics chapter 12 solution which 10 questions are from the exercise and 7 are additional questions.

The reasons for preferring AC over DC are mainly the easiness of converting one type of voltage into another higher voltage to lower or vice-versa via use of transformers. Also, the energy losses are less in AC as compared to DC. It also introduces the concept of single-phase transformers.

The chapter has 11 questions and 15 additional questions. Chapter 8 Electromagnetic Waves: The last chapter of class 12 physics NCERT book part 1 has 10 questions and 5 additional questions and you will find all the solutions by clicking the chapter link. The chapter introduces some modifications in some laws studied in previous chapters and introduces the electro-magnetic properties of light.

You will get to know how different reflecting surfaces plane, convex or concave mirrors, etc and refracting surfaces convex or concave lens form images of the different objects. This chapter is really very important for boards as well as exam perspective, hence you should solve each and every question carefully.

The chapter has 38 questions in total. Also, chapter wave optics introduces the concept of interference, diffraction, and polarization of light. The chapter has 10 questions and 11 additional questions. You will get the NCERT solutions class 12 physics to all questions by clicking the chapter link.

Chapter 11 Dual Nature Of Radiation And Matter: The chapter 11 of physics NCERT book talks about the dual nature of radiation and matter, it explains the photoelectric effect and what are effects of intensity of light and potential on the photoelectric current. The photoelectric effect is the evidence of the particle nature of radiation and the phenomena like interference, diffraction, and polarization indicate about wave nature of matter and radiation.

The chapter has a total of 37 questions out of which 19 questions are exercise questions and 18 are additional questions. Chapter 12 Atoms: Chapter 12 of class 12 physics has a total of 17 questions and you will find all the solutions of NCERT class 12 physics chapter 12. Chapter 12 introduces different models of the atom and their merits and demerits, it also discusses different line spectrum series of the Hydrogen atom, frequency, wavelength, and energy of atoms.

Chapter 13 Nuclei: After reading chapter 12 Atoms you will now read about the nuclei of atoms. You will find out what are the components of nuclei and their size, mass and stability. Chapter 13 Nuclei of physics NCERT book of class 12 introduces the concept of the nucleus, nuclear decay, nuclear fission and fusion.

You will be amazed to know that about The chapter has 22 questions and 9 additional questions and you will find step-by-step class 12 physics NCERT solutions.

This chapter will also introduce you to basic and important devices that use semiconductors for their functionality, for example, a diode or a transistor. Semiconductors are very important because smart ncert solutions class 10th physics chapter 12 solution like smartphones, LED TVs and many other gadgets are nearly impossible to build without using semiconductors.

The chapter has 11 questions and 8 additional questions and you can find all the solutions of this chapter in a very comprehensive manner. Happy learning!!! Answer: All the chapters are important. Questions from all the chapters will be asked for the board exam. Answer: The unit optics have the highest weightage for the board exam. Around 14 marks questions are asked from the unit optics. This includes the chapters ray optics and wave optics.

Answer: The NCERT solutions of physics are helpful for both board exam and competitive exam science these solutions helps in better understanding of the subject. When you look back in lifethis app would have played a huge role in laying the foundation of your career decisions.

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Know More Share. Table of contents. Start Now. Benefits of NCERT Solutions for Class 12 Physics As the solutions are presented in a very comprehensive manner they will also help in writing the solutions in the exam because writing solutions is also a very important skill.

It gives you in-depth knowledge of the concepts and chapters also these will help you in various competitive exams. In class 12 physics NCERT solutionslogical approach and methodology are used to develop your logical thinking which is needed not only for physics but to study every subject. Question: Which unit of class 12 physics have highest weightage for CBSE board exam Answer: The unit optics have the highest weightage for the board exam.

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All the questions are solved here with respect to the method and procedures explained in the textbook. The PDF for all the chapters are provided here, students can download them and learn offline as well.

Solving the questions present in the textbooks is not an easy task. It requires mathematical and logical skills to solve those problems with a lot of efforts. Class 12th Physics is a next level Physics, where students will learn a large variety of topics, which they are going to face in higher studies as well, such as in Class 12th.

How many chapters are there in class 12 physics? The NCERT textbook for physics for class 11 and 12 is more than enough for any kind of exam if it is studied properly and each numerical is solved with proper care. All of us have the experience of seeing a spark or hearing a crackle when we take off our synthetic clothes or sweater, particularly in dry weather. This is almost inevitable with ladies garments like a polyester saree.

Another common example of electric discharge is the lightning that we see in the sky during thunderstorms. We also experience a sensation of an electric shock either while opening the door of a car or holding the iron bar of a bus after sliding from our seat.

The reason for these experiences is the discharge of electric charges through our body, which was accumulated due to rubbing of insulating surfaces.

You might have also heard that this is due to the generation of static electricity. This is precisely the topic we are going to discuss in this and the next chapter.

Static means anything that does not move or change with time. Electrostatics deals with the study of forces, fields, and potentials arising from static charges. When an external force does work in taking a body from a point to another against a force like spring force or gravitational force, that work gets stored as the potential energy of the body. When the external force is removed, the body moves, gaining kinetic energy and losing an equal amount of potential energy.

The sum of kinetic and potential energies is thus conserved. Forces of this kind are called conservative forces. Spring force and gravitational force are examples of conservative forces. Coulomb force between two stationary charges is also a conservative force.

Thus, like the potential energy of a mass in a gravitational field, we can define the electrostatic potential energy of a charge in an electrostatic field. Charges in motion constitute an electric current. Such currents occur naturally in many situations.

Lightning is one such phenomenon in which charges flow from the clouds to the earth through the atmosphere, sometimes with disastrous results.

The flow of charges in lightning is not steady, but in our everyday life, we see many devices where charges flow in a steady manner, like water flowing smoothly in a river. A torch and a cell-driven clock are examples of such devices.

In the present chapter, we shall study some of the basic laws concerning steady electric currents. In this chapter, we will see how magnetic field exerts forces on moving charged particles, like electrons, protons, and current-carrying wires. We shall also learn how currents produce magnetic fields. We shall see how particles can be accelerated to very high energies in a cyclotron. We shall study how currents and voltages are detected by a galvanometer.

In this and subsequent Chapter on magnetism, we adopt the following convention: A current or a field electric or magnetic emerging out of the plane of the paper is depicted by a dot. A current or a field going into the plane of the paper is depicted by a cross. Magnetic phenomena are universal in nature. Vast, distant galaxies, the tiny invisible atoms, humans, and beasts all are permeated through and through with a host of magnetic fields from a variety of sources.

In the previous chapter, we have learned that moving charges or electric currents produce magnetic fields. In the present chapter, we take a look at magnetism as a subject in its own right. Answer: A battery.

Question 2 What is meant by saying that the potential difference between two points is IV? Answer: The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 coulomb of electric charge from one point to the other.

Question 3 How much energy is given to each coulomb of charge passing through a 6 V battery? Question 1 On what factors does the resistance of a conductor depend? OR List the factors on which the resistance of a conductor in the shape of a wire depends.

Question 2 Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source?

Answer: The current will flow more easily through a thick wire than a thin wire of the same material. Larger the area of cross-section of a conductor, more is the ease with which the electrons can move through the conductor.

Therefore, smaller is the resistance of the conductor. Question 3 Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it? Answer: When potential difference is halved, the current through the component also decreases to half of its initial value.

Question 4 Why are coils of electric toasters and electric irons are made of an-alloy rather than a pure metal? OR Why are alloys commonly used in electric heating devices? Given reason. Question 5 Use the data in Table Thus iron is a better conductor because it has lower resistivity than mercury. Answer: The required circuit diagram is shown below :.

What would be the readings in the ammeter and the voltmeter? Solution: The required circuit diagram is shown on the right. Answer: When the resistances are connected in parallel, the equivalent resistance is smaller than the smallest individual resistance.

What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it? Question 3 What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Answer: Advantages of connecting electrical devices in parallel with the battery are :. Solution: i Highest resistance can be obtained by connecting the four coils in series. Question 1 Why does the cord of an electric heater not glow while the heating element does?

Solution: Heat generated in a circuit is given by I 2 R t. The heating element of an electric heater made of nichrome glows because it becomes red-hot due to the large amount of heat produced on passing current because of its high resistance, but the cord of the electric heater made of copper does not glow because negligible heat is produced in it by passing current because of its extremely low resistance.

Question 2 Compute the heat generated while transferring coulomb of charge in one hour through a potential difference of 50 V. Calculate the heat developed in 30 s. Question 1 What determines the rate at which energy is delivered by a current?

Answer: Resistance of the circuit determines the rate at which energy is delivered by a current. Question 2 An electric motor takes 5 A from a V line.

Determine the power of the motor and the energy consumed in 2 h. Question 1 A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. Question 2 Which of the following terms does not represent electrical power in a circuit? Question 3 An electric bulb is rated V and W. Question 4 Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference.

The ratio of heat produced in series and parallel combinations would be : a 1 : 2 b 2 : 1 c 1 : 4 d 4 : 1 Answer: c 1 : 4. Question 5 How is a voltmeter connected in the circuit to measure the potential difference between two points?

Answer: A voltmeter is connected in parallel to measure the potential difference between two points. Question 6 A copper wire has diameter 0. How much does the resistance change if the diameter is doubled? Answer: If a wire of diameter doubled to it is taken, then area of cross-section becomes four times. Question 7 The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below : Plot a graph between V and I and calculate the resistance of the resistor.

Solution: The graph between V and I for the above data is given below. The slope of the graph will give the value of resistance.

Let us consider two points P and Q on the graph. Question 8 When a 12 V battery is connected across an unknown resistor, there is a current of 2. Find the value of the resistance of the resistor. Question 9 A battery of 9V is connected in series with resistors of 0.

How much current would flow through the 12 Q resistor? Thus 4 resistors are needed to be connect. The equivalent resistance is. Question 12 Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of V line if the maximum allowable current is 5 A? What are the currents in the three cases? Solution: i When the two coils A and B are used separately.

Solution: i The circuit diagram is shown in figure. Question 15 Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply.

What current is drawn from the line if the supply voltage is V? Calculate the rate at which heat is developed in the heater. Question 18 Explain the following: i Why is tungsten used almost exclusively for filament of electric lamps? If the area of cross section of a conductor of fixed length is increased, then resistance decreases because there are more free electrons for movement in conductor.

So, they do not become too hot on passing electric current. Electric current, potential difference and electric current, Ohms law, Resistance, Resistivity factors on which the resistance of a conductor depends; Series combination of resistors, parallel combination of resistors; and its application on daily life; Heating effect of Electric current, electric Power, Interrelation between P, V, and R.

Formulae Handbook for Class 10 Maths and Science. Page What does an electric circuit mean? Electric circuit is a continuous and closed path made of conducting wires, through which the electric current flows. It comprises a cell, ammeter, voltmeter, plug key, etc. Define the unit of current. SI unit of electric current is ampere A. Ampere is the flow of electric charges through an area at the rate of one coulomb per second, i.

Question 1: Name a device that helps to maintain a potential difference across a conductor. Answer: Cell or battery eliminator. Question 2: What is meant by saying that the potential difference between two points is 1 V? Concept Insight:- Resistivity and melting point are two important factors here. The resistivity of an alloy is higher than the pure metal.

Moreover, at high temperatures, the alloys do not melt readily. Hence, the coils of heating appliances such as electric toasters and electric irons are made of an alloy rather than a pure metal. Resistivity of mercury is more than that of iron. This implies that iron is a better conductor than mercury. Hence, it is the best conductor. The following circuit diagram shows three resistors of resistances 5 ohm, 8 ohm and 12 ohm respectively connected in series with a battery of potential 6 V and a plug key.

Concept Insight:- The voltages of cells in series add up to give the final voltage. To measure the current flowing through the resistors, an ammeter should be connected in the circuit in series with the resistors.

To measure the potential difference across the 12 ohm resistor, a voltmeter should be connected in parallel to this resistor, as shown in the following figure. Concept Insight:- Ohm's law can be used to obtain the readings of ammeter and voltmeter.

Concept Insight:- For parallel combination, equivalent resistance R is given by. These are connected in parallel, as shown in the following figure. Therefore, the resistance of the electric iron is The advantages of connecting electrical devices in parallel with the battery instead of connecting them in series are:.

In parallel circuit, if one electrical device stops working, then all other devices keep working normally. This is not the case when devices are connected in series. There is no division of voltage among the appliances when connected in parallel.

The potential difference across each appliance is equal to the supplied voltage. In series circuit, the applied voltage is shared by all the appliances. The total effective resistance of the circuit can be reduced by connecting electrical appliances in parallel.

In series combination, the total effective resistance of the circuit increases. Concept Insight:- All the resistors are connected in parallel.

Therefore, their equivalent resistance will be given as. Therefore, 48 ohm is the highest total resistance that can be secured by the combination of given resistances. If these coils are connected in parallel, then the equivalent resistance will be the lowest, given by.

Therefore, 2 ohm is the lowest total resistance that can be secured by the combination of given resistances. Concept Insight:- The amount of heat produced in a conductor is proportional to its resistance.

The resistance of the heating element of an electric heater is very high. As current flows through the heating element, it becomes too hot and glows red. On the other hand, the resistance of the cord of the heater is much lower, so it does not become very hot and does not glow when current flows through it.

Therefore, the amount of heat developed in the electric iron is. The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.

Concept Insight:- Power of an appliance determines the rate at which electrical energy is delivered to it. Concept Insight:- Power of an appliance can be determined by the rate at which electrical energy is delivered to it. Concept Insight:- For parallel combination, equivalent resistance R' is given by.

From equation ii , it can be written Power P cannot be expressed as IR 2.

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