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An electric dipole of dipole moment vecP...

An electric dipole of dipole moment `vecP` is placed parallel to the uniform electric field of intensity `vecE.` On rotating it through `180^(@)` the amount of work done is ..... .

A

zero

B

`-2 p E `

C

pE

D

2 pE

Text Solution

Verified by Experts

The correct Answer is:
B
` W = -" p E cos " theta_(2) - (- p E cos theta_(1))`
`= p E( cos 0^(@) - cos 180^(@)]`
p E [ 1-(-1)]
= 2 pE
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