First slide

Electrostatic force

Question

Force of attraction between two point charges Q and – Q separated by d metre is F_e. When these charges are placed on two identical spheres of radius R = 0.3d whose centres are d metre apart, the force of attraction between them is

Easy

A

Greater than F_e
B

Equal to F_e
C

Less than F_e
D

Greater than or equal to F_e

Solution

Separation between the spheres is not too large as compared to their radius so due to induction effect redistribution of charge takes place. Hence effective charge separation decreases so force increases.

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