Electrostatics Question 315

Question: 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]

Options:

A) Zero

B) $ \frac{\pi }{2} $

C) $ \pi $

D) $ \frac{3\pi }{2} $

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Answer:

Correct Answer: A

Solution:

$ U=-PE\cos \theta $

It has minimum value when q = 0o i.e. $ {{(U _{P})} _{\min }}=-PE\times \cos 0^{o}=-PE $



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