HARD
JEE Advanced
IMPORTANT
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Assertion: We have a solid charged sphere. There are two points P and Q. P is a point lying between centre and surface of the sphere. Q is at finite and non-zero distance from the surface outside the sphere. There will be no situation where electric potential is equal at P and Q.

Reason: Rate of change of electric field with distance from centre merely represents, magnitude of electric potential at that point.

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Important Questions on Electrostatics

EASY
JEE Advanced
IMPORTANT

Assertion: Cyclotron is used to accelerate heavy charged particles, such as a proton. It is not suitable for accelerating light charged particles such as electrons.

Reason: Specific charge of a proton is more than compared to the electron.

MEDIUM
JEE Advanced
IMPORTANT
Assertion: Five charges +q each are placed at five vertices of a regular pentagon. A sixth charge -Q is placed at the centre of pentagon. Then, net electrostatic force on -Q is zero.

Reason: Net electrostatic potential at the centre is zero. 

MEDIUM
JEE Advanced
IMPORTANT

Assertion: Inside a solid charged sphere E-r variation is linear.

Reason: Inside that solid charged sphere V-r variation is parabolic.

HARD
JEE Advanced
IMPORTANT

Assertion: Two charges +Q each are fixed at two points. If a third charge +q is placed at centre, then this charge is in stable equilibrium condition line joining the charges.

Reason: Electrostatic potential energy of the system in this position is minimum.

EASY
JEE Advanced
IMPORTANT

Assertion: Two concentric spherical shells A and B are charged by charges qA and qB. If qA is negative, then VA-VB is also negative.

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Reason: VA-VB=qA4πε01RA-1RB. Therefore, if qA is negative, then VA-VB is also negative.

MEDIUM
JEE Advanced
IMPORTANT

Assertion: Two identical balls are charged by q. They are suspended from a common point by two insulating threads I each. In equilibrium, the angle between the threads is 180°. (Ignore gravity)

Reason: In equilibrium tension in the springs is T=14πε0q·ql2

EASY
JEE Advanced
IMPORTANT

Assertion: With the help of Gauss theorem, we can find electric field at any point.

Reason: Gauss theorem can be applied for any type of charge distribution.

EASY
JEE Advanced
IMPORTANT

Assertion: When a capacitor is charged by a battery half of the energy supplied by the battery is stored in the capacitor and the rest half is lost.

Reason: If resistance in the circuit is zero, then there will be no loss of energy.