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An electric dipole moment p is aligned p...

An electric dipole moment p is aligned parallel to a uniform electric field E. The work done by external agent to rotate the dipole slowly by `90^@` from stable equilibrium position is

A

pE

B

2pE

C

`(sqrt3)/(2)pE`

D

`(pE)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`W=DeltaU =pE(costhetae_1 - costheta_2)`
`W=pE(cos0^(@) - cos90^@)`
=pE
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