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: T2cosθ=mgor T2=mgcosθObviously, T2>mg.Here we have assumed θ to be small so that F is almost horizontal.