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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
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
1 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
3 Can two equipotential surfaces intersect? Justify your answer.
Ans: No. Otherwise it would mean two directions for force at a point.
4 Is potential gradient a vector or a scalar quantity?
Ans: Scalar quantity
5 Write the dimensional formula of ‘є0 ‘the permittivity of free space.
Ans: [M-1L-3T4A2]
6 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
7 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
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.
| CBSE Class 12 Physics Alternating Current Notes Set A |
| CBSE Class 12 Physics Alternating Current Notes Set B |
| CBSE Class 12 Physics Wave Optics Notes Set A |
| CBSE Class 12 Physics Wave Optics Notes Set B |
CBSE Class 12 Physics Chapter 3 Current Electricity Notes
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Notes for Physics CBSE Class 12 Chapter 3 Current Electricity
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Chapter 3 Current Electricity Notes for Physics CBSE Class 12
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Chapter 3 Current Electricity CBSE Class 12 Physics Notes
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Notes for CBSE Physics Class 12 Chapter 3 Current Electricity
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