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 $
Show Answer
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 $
