Questions  

A pendulum bob of mass 30.7×106kg and carrying a charge 2×108C is at rest in a horizontal uniform electric field of 20000 V/m. The tension in the thread of the pendulum is (g=9.8m/s2)

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By Expert Faculty of Sri Chaitanya
a
3×10−4 N
b
4×10−4 N
c
5×10−4 N
d
6×10−4 N
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detailed solution

Correct option is C

T=(mg)2+(QE)2=30.7×10−6×9.82+2×10−8×200002=5×10−4N

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