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An electric dipole of dipole moment p is...

An electric dipole of dipole moment p is placed in a uniform electric field E. Initially the dipole is aligned parallel to the field. The dipole is now rotated so that it becomes antiparallel to the field. Work required to be done on the dipole by an external agency is

A

– 2pE

B

– pE

C

pE

D

2pE

Text Solution

Verified by Experts

The correct Answer is:
D
`W = u_2 - u_1 = (-pE cos 180^@ ) - (- pE cos 0^@) = 2pE`
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