First slide

Electrostatic potential

Question

When an uncharged metallic sphere A is brought near a positively charged metallic sphere B, then

Moderate

A

potential of A decreases and potential of B increases.
B

potential of A increases and potential of B decreases
C

potential of A remains unchanged and potential of B increases
D

potential of A increases and potential of B remains unchanged.

Solution

Negative charge is induced on the nearer surface of A and equal amount of positive charge is induced on the surface which is away from B. Potential of A due to induced charges does not change but due to the positive charge on B, potential of A increases.
Since the induced negative charge on A is nearer to B and induced positive charge is away from B, potential of B decreases.

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