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An electric dipole of moment vec(P) is l...

An electric dipole of moment `vec(P)` is lying along a uniform electric field `vec(E )`. The work done in rotating the dipole by `90^(@)` is:

A

`sqrt2`pE

B

`pE/2`

C

2pE

D

p E

Text Solution

Verified by Experts

The correct Answer is:
D
Work done in rotating a diole from `0_(1) to 0_(2)` is
`W=pE(cos0_(1)-cos 0_(2))`
Here `0_(1)=0^(@) and 0_(2)=90^(@) therefore W=pE`
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