Q.

Force of attraction between two point charges Q and – Q separated by d metre is Fe. 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

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a

Greater than Fe

b

Equal to Fe

c

Less than Fe

d

Greater than or equal to Fe

answer is A.

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Detailed 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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