An electric dipole of dipole moment $\vec P$ is lying along a uniform electric field $\vec E$ . The work done in rotating the dipole by $90^o$ is
An electric dipole of dipole moment $\vec P$ is lying along a uniform electric field $\vec E$ . The work done in rotating the dipole by $90^o$ is
- A
$2pE$
- B
$pE$
- C
$\sqrt 2\, pE$
- D
$\frac{{pE}}{2}$
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