NCERT Solutions for Class 12 Physics Chapter 3: The chapter on NCERT Class 12 Physics Electrostatic Current Electricity focuses on teaching students about the laws governing the nature of electric current, and more. The chapter will also let the learners know regarding the contribution of eminent scientists such as OHM and Kirchhoff towards electricity. As far as your doubts on this chapter are concerned, it will be cleared once you start solving the NCERT Class 12 Physics Chapter 3 questions.
To aid you in quick revision and clearing of doubts, Embibe has provided you with the full NCERT Solutions for Class 12 Physics Chapter 3. Each of these solutions is prepared by experts and covers all the basic NCERT guidelines.
Overview Of Class 12 Physics Chapter 3 – Current Electricity
It is necessary for you to know the topics and sub-topics of NCERT Class 12 Physics Chapter 3 in order to move further with the topic. Accurate knowledge of the topics under NCERT Class 12 Physics Chapter 3 will help you in retaining the information:
|3.3||Electric Currents in Conductors|
|3.5||Drift of Electrons and the Origin of Resistivity|
|3.6||Limitations of OHM’s Law|
|3.7||Resistivity of Various Materials|
|3.8||Temperature Dependence of Resistivity|
|3.9||Electrical Energy, Power|
|3.10||Combination of Resistors- Series and Parallel|
|3.11||Cells, EMF, Internal Resistance|
|3.12||Cells in Series and in Parallel|
NCERT Solutions for Class 12 Physics Chapter 3 PDF Download
Class 12 Physics Chapter 3 Current Electricity will teach you about circuit diagrams, graphs, illustrations, energy diagrams through examples associated with daily life to make the topic easy for you. You will also learn that current is a scalar although it is represented with an arrow. Currents do not obey the law of vector addition. Moreover, homogeneous conductors like silver or semiconductors like pure germanium or germanium containing impurities obey Ohms’s law. However, this may be applicable within some range of electric field values.
Kirchhoff’s junction rule is based on conservation of charge and the outgoing currents add up and are equal to incoming current at a junction. Along with the NCERT Class 12 Physics Chapter 3 description, it is recommended for the students to solve the NCERT Solutions for Class 12 Physics Chapter 3 in order to understand the topic better. You can download the full Chapter 3 Physics Solution PDF or go through the pages one by one from below:
NCERT Solutions for Class 12 Physics Chapter 3: Current Electricity
This NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity, will give you a chance to learn about current electricity in a more defined manner. In this chapter, you will learn that current through a given area of a conductor is the net charge passing per unit time through the area. In order to maintain a steady current, you must have a closed circuit in which an external agency. The work done per unit charge by the source in taking the charge from lower to higher potential energy is called the electromotive force, or emf, of the source. You will know that the emf is not a force but the voltage difference between two terminals of a source in an open circuit.
The NCERT Solutions for Class 12 Physics Chapter 3 plays a crucial role by helping you in understanding the type of questions as well as have a quick revision of the topic.
|NCERT Solutions for Class 12 Physics Chapter 2||Class 12 NCERT Solutions for All Chapters of Physics||NCERT Solutions for Class 12 Physics Chapter 4|
Important Questions Of Class 12 Physics Chapter 3
Given below are the important questions of Class 12 Physics Chapter Electricity. We have classified them into very short, short, long and descriptive:
|Very Short Anwer Type Important Questions|
1. Why GaAs is most commonly used in making of a solar cell.
2. Nichrome and copper wires of the same length and same radius are connected in series. Current ‘I’ is passed through them. Which wire gets heated up more? Justify your answer.
3. Show a graph, the variation of resistivity with temperature for a typical semiconductor?
4. The emf of a cell is always greater than its terminal voltage. Why? Give reason.
5. Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
|Short Anwer Type Important Questions|
1. Derive an expression for the resistivity of a good conductor, in terms of the relaxation time of electrons.
2. A wire of 15-ohm resistances is gradually stretched to double its original length. It is then cut into two equal parts. These parts are then connected in parallel across a 3.0-volt battery. Find the current down from the battery.
3. A light bulb is rated 100 W for 220 V ac supply of 50 Hz. Calculate
(i) the resistance of the bulb;
(ii) the rms current through the blub.
4. Explain the term ‘drift velocity’ in a conductor. Hence obtain the expression for the current through a conductor in terms of ‘drift velocity’.
|Long Anwer Type Important Questions from Environmental Issues|
1. (i) State the principle of working of a meter bridge.
(ii) In a meter bridge, balance point is found at a distance 1 with resistance R and S as shown in the figure.
When an unknown resistance X is connected in parallel with the resistance S, the balance point shifts to a distance a l2 find the expression for X terms of l1 l2and S.
2. State Kirchhoff’s rules. Use these rules to write expressions for the currents Ii, I2 and I3 in the circuit diagram shown.
3. Define the relaxation time of the free electrons drifting in the conductor. How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for the electrical resistivity of the material.
|Descriptive Anwer Type Important Questions|
1. (a) State the working principle of a potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emfs of two primary cells. Obtain the required expression used for comparing the emfs.
(b) Write two possible causes for one-sided deflection in a potentiometer experiment.
2. Derive an expression for drift velocity of electrons in a conductor. Hence deduce Ohm’s law.
(ii) A wire whose cross-sectional area is increasing linearly from its one end to the other is connected across a battery of V volts.
Which of the following quantities remain constant in the wire?
(a) drift speed
(b) current density
(c) electric current
(d) electric field.
3. A room has AC run for 5 hours a day at a voltage of 220V. The wiring of the room consists of Cu of 1mm radius and a length of 10 m. Power consumption per day is 10 commercial units. What fraction of it goes in the joule heating in wires? What would happen if the wiring is made of aluminium of the same dimensions?
Attempt Class 12 Physics Mock Test For Free
This extensive write-up on NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity will aid in clearing all your doubts regarding this topic. It is required of you to take the help of solutions given in this article so as to prepare for the exam in the best way possible. Solve the NCERT Solutions for Class 12 Physics Chapter 3 PDF to have an outstanding preparation ahead.
Also, simultaneously take mock tests and practice previous year questions to get a hang of the questions. You can practice Current Electricity Questions on Embibe to know the chapter better. Also, if you are planning to appear for competitive exams like JEE Main, then you can take the JEE Main Mock Test on Embibe for free.
Frequently Asked Questions
Here are some frequently asked questions related to NCERT Solutions For Class 12 Physics Chapter 3 PDF so have a look related to it.
Q1. Did Embibe provide NCERT Solutions For Class 12 Physics for all chapters?
A. Yes, Embibe has given all the NCERT Solutions For Class 12 Physics for all Chapters here.
Q2. How many topics are there in NCERT Solutions For Class 12 Physics Chapter 3?
A. There are a total of 16 Exercises or topics are there in NCERT Solutions For Class 12 Physics Chapter 3
Q3. Where I can download CBSE Class 12 Physics Chapter 3 Solutions PDF?
A. Embibe has given CBSE Class 12 Physics Chapter 3 Solutions/ Current Electricity NCERT solutions on this page, so you can download the PDF
Q4. Is there any charge for downloading NCERT Solutions For Class 12 Physics Chapter 3 PDF?
A. Embibe does not charge a penny for NCERT Solutions for Class 12 Physics Chapter 3 PDF Download
Q5. What is the name of Class 12th Physics Chapter 3?
A. NCERT Solutions For Class 12 Physics Chapter 3 is available for chapter Current Electricity.
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