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Q.

An isolated charge q1 of mass m is suspended freely by a thread of length l. Another charge q2 is brought near it (r >> l). When q1 is in equilibrium tension in thread will be

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a

mg

b

>mg

c

d

none of these

answer is B.

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Detailed Solution

Initial tension: T1=mgFinal tension: T2cos⁡θ=mgor T2=mgcos⁡θObviously, T2>mg.Here we have assumed θ to be small so that F is almost horizontal.
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