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Q.

Two identical charged particles having charge 2×10−8C each are joined by an insulating string of length 1m and system is kept on a smooth horizontal table. Tension in the string is              

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a

0.36×10−4N

b

3.6×10−6N

c

3.6×10−5N

d

10.36×10−6N

answer is C.

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Detailed Solution

T=F=14πε0.q1q2r2

=9×109×4×10−161=3.6×10−6N

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