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  4. An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90° is :

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Q. An electric dipole of dipole moment $p$ is aligned parallel to a uniform electric field $E$. The energy required to rotate the dipole by $ 90^\circ $ is :

NEETNEET 2013Electric Charges and Fields

Solution:

W orkdone $=\Delta pE$
$ \begin{array}{l} pE =-\overrightarrow{ p } \overrightarrow{ E } \\ pE _{ f }=0 \\ pE _{ i }=- pE \\ \Delta pE = pE \end{array} $