An electric dipole of moment \[\overrightarrow{p}\] placed in a uniform electric field \[\overrightarrow{E}\] has minimum potential energy when the angle between \[\overrightarrow{p}\] and \[\overrightarrow{E}\] is [UPSEAT 2004]

• A.                    Zero           
• B.                                      \[\frac{\pi }{2}\]
• C.                    \[\pi \]
• D.                                      \[\frac{3\pi }{2}\]