CBSE Class 12 Physics Worksheet Set 06

Class 12 Physics Practice Set: All Chapters

Review targeted practice sets for Class 12 Physics All Chapters. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.

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“An education isn't how much you have committed to memory, or even how much you know. It's being able to differentiate between what you know and what you don't.”
Anatole France
 
ELECTROSTATICS
 
1 In a parallel plate capacitor the capacitance increases from 16μF to 80μF on introducing a dielectric medium between the plates. What is the dielectric constant of the medium ?
K = Cm/Ca = 80/16 = 5
 
2 The force between two point charges kept at a distance of r apart is F. If the same charges are kept in water at the same distance, how does the force between them change?
Fa/Fw = K , Fw/Fa = 1/K =1/81
 
3 Under what conditions The electric field intensity due to two point charges be zero at a point in the line joining the two charges but the point should not be between the charges ?
The two charges should be of opposite charges and they should have different magnitudes.
 
4 How much work is done in moving a 500μC of charge between two points on a spherical Surface at a potential of 4V?
Zero. Work done in moving a charge along an equi potential surface is zero .
 
5 If the plates of a parallel plate capacitor are connected to each other by a copper wire, what will happen?
The charge will flow from positive to negative plate and the capacitor will be discharged completely. So the energy stored is dissipated as heat energy.
 
6 A very thin metal plate of thickness t << d is kept in the middle of a parallel plate capacitor .
What will be the effect on the capacitance of the system?
No change in the capacitance.
 
7 A 12pF capacitor is connected to a 50V supply. Calculate the electrostatic energy stored in
the capacitor.
U = ½ CV2 = ½ x 12 x 10-12 x 2500 =1.5 x10-8J
 
8 Define equi potential surface. Can two equi potential surfaces intersect?
If all the points on a surface are at the same potential such a surface is equi potential surface.
Two equi potential surfaces cannot intersect if they intersect , two electric field lines must intersect which is not possible.
 
9 Define dielectric field strength .
It is the maximum electric field strength a medium can withstand before break down.
 
10 The plates of a charged parallel plate capacitor are connected to a volt meter , what will be the effect of increasing the separation between the plates on the voltmeter reading?
Voltmeter reading increases.
 
11 How does the electric field inside a dielectric change when it is placed in an external electric field?
It decreases as the induced electric field is opposite to the applied field. Net electric field decreases.
 
12 The energy stored in a capacitor of capacitance C is U ,Express the charge Q stored in it in terms of
C and U.
Q= (2CU)1/2
 
13 What is the function of dielectric in a capacitor?
It increases the capacitance by reducing the effective potential difference between the plates.It increases the mechanical strength of capacitor.
 
14 A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V.What is the potential at the centre of the sphere?
10 V. Potential inside a hollow metal surface is equal to its potential on the surface.
 
15 Can there be a potential difference between two adjacent conductors carrying the same charge?
Yes , if their sizes are different.
 
16 What is the geometrical shape of equi potential surfaces due to a single isolated charge?
Spherical for q>0 and q<0.
 
17 Name a Physical quantity whose SI unit is i) J/C ii) J /m3 iii) Volt /m .
State whether it is a scalar or vector quantity?
i) electric potential – scalar ii) energy density – scalar iii) electric field strength – vector
 
18 What is the dielectric constant of a metal?
Infinity , as the electric field inside a conductor (metal ) is zero
 
19 Why is the potential inside and on the surface of hollow conducting sphere same and remains constant?
dV = -E.dl since electric field inside the conductor is zero dV = 0 V is constant.
 
20 State the differences between electric potential at a point due to a single point charge and an electric dipole.
CBSE Class 12 Physics Worksheet Set F 1
 
21 State a similarity and a difference between the mass and charge of a particle.
Similarity : both are scalars
Differences:
Only charge is quantised ,mass is not quantised .
charge can be negative ,positive and zero but mass is a positive quantity.


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All Chapters Practice Sheet and Solutions for Class 12 Physics

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Are these Physics Class 12 worksheets based on the 2026-27 competency-based pattern?

Yes, our CBSE Class 12 Physics Worksheet Set 06 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 12.

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