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

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

A

a)`0.245J`

B

b)`2.45x10^(-4)J`

C

c)`0.0245J`

D

d)`24.5J`

Text Solution

Verified by Experts

Torque , `tau=pEsintheta`
or `p=(tau)/(Esintheta)`
Potential energy , `U=pEcostheta`
`=(tau)/(Esintheta)*Ecostheta`
`=(tau)/(Etan theta)=(10sqrt(2))/(10^(4)tan30^(@))`
`=24.5xx10^(-4)J`
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