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  4. A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If θ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when θ is

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Q. A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If $ \theta $ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when $ \theta $ is

KEAMKEAM 2011

Solution:

Dipole energy
$ U=-pE\,\cos \theta $ When U is maximum $ \cos \theta =-1 $
$ \theta =\pi $