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An electric dipole of length 1 cm is pla...

An electric dipole of length 1 cm is placed with the axis making an angle of `30^(@)` to an electric field of strenght `10^(4) NC^(-1)` . If it experience a taroue of `10 sqrt(2)Nm` , the potential energy of the dipole is :

A

`0.245J`

B

`2.45xx10^(-4)J`

C

`0.0245J`

D

`245.0J`

Text Solution

Verified by Experts

The correct Answer is:
B
Torque , `tau=pEsinthetarArrp=(tau)/(Esintheta)`
Potential energy , `U=pEcostheta=(tau)/(Esintheta)Ecostheta`
`=(tau)/(Etantheta)=(10sqrt(2))/(10^(4)tan30^(@))=24.5xx10^(-4)J`
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