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An electric dipole is placed at an angle...

An electric dipole is placed at an angle of `30^(@)` with an electric field intensity `2xx10^(5)N//C`. It experiences a torque equal to `4Nm`. The charge on the dipole, if the dipole is length is `2 cm`, is

A

5mC

B

7mC

C

8mC

D

2mC

Text Solution

Verified by Experts

The correct Answer is:
D
`tau = pE sin theta`
`tau= ql E sin theta`
`4=q xx 2 xx 10^(-2) xx 2 xx 10^(6) sin 30^(@)`
`rArr q=2mC`
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