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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

`3 xx10^(-4) N`

B

`4 xx10^(-4) N`

C

`5 xx10^(-4) N`

D

`6 xx10^(-4) N`

Text Solution

Verified by Experts

The correct Answer is:
C
`T=sqrt((mg)^2+(qE)^2)`
`=sqrt((30.7xx10^(-6)xx9.8)^(2)+(2xx10^(-8)xx2 xx10^4)^2)`
`=sqrt(2.50 xx10^(-7))`
`~~5 xx10^(-4) N`
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