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A pendulum bob of mass 30.7 xx 10^(-6)kg...

A pendulum bob of mass `30.7 xx 10^(-6)kg` and carrying a chargee `2 xx 10^(-8)C` is at rest in a horizontal uniform electric field of `20000V//m`. The tension in the thread of the pendulum is `(g = 9.8 m//s^(2))`

A

`3xx10^(-4)N`

B

`4xx10^(-4)N`

C

`5xx10^(-4)N`

D

`6xx10^(-4)N`

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