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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 of intensity `2xx10^(5)NC^(-1)`. It experiences a torque equal to 4 N m. The charge on the dipole if the dipole length is 2 cm is

A

8 mC

B

2 mC

C

5 mC

D

`7muC`

Text Solution

Verified by Experts

The correct Answer is:
B
`tau=pEsintheta`
`tau=qlEsintheta`
`q=(tau)/(lEsintheta)`
`q=(4)/(2xx10^(-2)xx2xx10^(5)xx(1)/(2))`
`q=2xx10^(-3)C`
`q=2mC`
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