CBSE Class 12 Physics Chapter-2 Important Questions – Free PDF Download
Free PDF download of Important Questions with Answers for CBSE Class 12 Physics Chapter 2 – Electrostatic Potential and Capacitance 1 Mark Questions prepared by expert Physics teachers from latest edition of CBSE(NCERT) books only by CoolGyan to score more marks in CBSE board examination.
CBSE Class 12 Physics Chapter-2 Important Questions
CBSE Class 12 Physics Important Questions Chapter 2 – Electrostatic Potential and Capacitance
1 Mark Questions
1. Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
Ans. The electric field, inside a dielectric decrease when it is placed is an external electric field due to polarisation as it creates an internal electric field opposite to external electric field inside a dielectric due to which net electric field gets reduced.
2. What is the work done in moving a 2
C point change from corner A to corner B of a square ABCD when a 10C charge exist at the center of the square?
Ans. Since pt. A & B are at the same distance from the pt. O
VA = VB
Work done = Zero.
3. Force of attraction between two point electric charges placed at a distance d in a medium is F. What distance apart should these be kept in the same medium, so that force between them becomes F/3?
Ans. If two point changes are 
separated by distance d
F = 
Suppose if force becomes F/3 let the distance be x
x = 
d
4. The distance of the field point on the equatorial plane of a small electric dipole is halved. By what factor will the electric filed due to the dipole change?
Ans. Since 
Electric field becomes eight times
5. The Plates of a charged capacitor are connected by a voltmeter. If the plates of the capacitor are moved further apart. What will be the effect on the reading of the voltmeter?
Ans. Since 
which means if distance increases, capacitance decreases.
Since 
and charge on the capacitor is constant.
Hence reading of the voltmeter increases.
6. What happens to the capacitance of a capacitor when a dielectric slab is placed between its plates?
Ans.The introduction of dielectric in a capacitor reduces the effective charge on plate and hence increases the capacitance.