Electrostatics Question 697

Question: When an electric dipole $ \vec{P} $ is placed in a uniform electric field E then at what angle between P and $ \vec{E} $ the value of torque will be maximum?

Options:

A) $ 90{}^\circ $

B) $ 0{}^\circ $

C) $ 180{}^\circ $

D) $ 45{}^\circ $

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Answer:

Correct Answer: A

Solution:

[a] $ \vec{\tau }=\vec{P}\times \vec{E}=PE\sin \theta $

$ \text{For }q=90{}^\circ ,{{\vec{\tau }} _{\max }}=PE $



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