CBSE Class 12 Physics Current Electricity Notes Set B

Download CBSE Class 12 Physics Current Electricity Notes Set B in PDF format. All Revision notes for Class 12 Physics have been designed as per the latest syllabus and updated chapters given in your textbook for Physics in Class 12. Our teachers have designed these concept notes for the benefit of Class 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Physics for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Physics given on studiestoday

Revision Notes for Class 12 Physics Chapter 3 Current Electricity

Class 12 Physics students should refer to the following concepts and notes for Chapter 3 Current Electricity in Class 12. These exam notes for Class 12 Physics will be very useful for upcoming class tests and examinations and help you to score good marks

Chapter 3 Current Electricity Notes Class 12 Physics

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Questions Marks

1. How does the force between the two charges vary when

(a) The system is immersed in a medium.

(b) When the distance between them is halved?

Ans : (a)F=1/K times F0 (b)F=4 times F0

2. How does the electric flux, electric field enclosing a given charge vary when the area enclosed by the charge is doubled?

Ans: (a) (b) E is halved

3. Why in Millikan’s Oil Drop experiment, the charge measured was always found to be of some discrete value and not any arbitrary value?

Ans: Because charge is always quantized ie., Q = n x e

4. Two electric lines never cross each other. Why? 

Ans: Two directions of electric filed at the point of intersection which is not possible.

5. What is meant by electrostatic shielding? 

Ans: Electric filed inside a cavity is zero.

6. Why an electric dipole placed in a uniform electric field does not undergoes acceleration? 

Ans: Because the net force on the dipole is zero. Fnet = 0 as F=

7. Why electric field lines

(i) Can never intersect one another?

(ii) Cannot for closed loops sometimes?

(iii) Cannot have break in between?

Ans : Because

(i) Electric field has an unique direction at any given point

(ii) Monopoles or single isolated charges exist unlike magnetism

(iii) Start from +ve charges and terminate at –ve charges.

ELECTRIC POTENTIAL

QUESTIONS

Is it possible that the potential at a point is zero, while there is finite electric field intensity at that point? Give an example.

Ans: Yes , Centre of a dipole

2.Is it possible that the electric field at a point is zero, while there is a finite electric potential at that point. Give an example.

Ans: Yes, Inside charged shell

Can two equipotential surfaces intersect? Justify your answer.

Ans: No. Otherwise it would mean two directions for force at a point.

Is potential gradient a vector or a scalar quantity?

Ans: Scalar quantity

Write the dimensional formula of ‘є0 ‘the permittivity of free space.

Ans: [M-1L-3T4A2]

An electric dipole is placed in an electric field due to a point charge. Will there be a force and torque on the dipole?

Ans: Yes, Both force and torque will act 2a

CBSE Class 12 Physics Current Electricity Notes Set B

An electron is placed at A, in the presence of a point charge +q located at C, is moved to a point B, such that ABC an equilateral triangle. Find the work done in this process

Ans: Zero

8. Draw the graph showing the variation of electric potential with distance from the centre of a uniformly charged shell.

Ans 

CBSE Class 12 Physics Current Electricity Notes Set B

9. Find the ratio of the electric field lines starting from a proton kept first in vacuum and then in a medium of dielectric constant 6.

Ans: 6 : 1


Please refer to attached file for CBSE Class 12 Physics Current Electricity.

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CBSE Class 12 Physics Chapter 3 Current Electricity Notes

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