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An electric dipole of moment p is palced...

An electric dipole of moment `p` is palced in the positive of stable equilibrium in uniform electric field of intensity `E`. It is rotated through an angle `theta` from the initial position. The potential energy of electric dipole in the final position is

A

`-pEcostheta`

B

`pE(-costheta)`

C

`pEcostheta`

D

`pEsintheta`

Text Solution

Verified by Experts

The correct Answer is:
B
To orient the dipole at any angle `theta` from its initial position work has to be done on the dipole from `theta=0^(@)` to `theta`
`therefore` Potential energy `=pE(1-costheta)`
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