Q.

A pendulum bob of mass 80 mg carrying a charge 108 C is at rest in a uniform horizontal electric field of 60 kV/m intensity. The tension in the thread in newtons is g=10 m/s2

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a

103

b

10

c

1000 

d

102

answer is B.

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Detailed Solution

Tension in the thread is 

T=q2E2+m2g2

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