JEE Main On 8 April 2017 Question 6
Question: A magentic dipole in a constant magnetic field has - [JEE Online 08-04-2017]
Options:
A) maximum potential energy when the torque is maximum
B) zero potential energy when the torque is maximum
C) zero potential energy when the torque is minimum
D) minimum potential energy when the torque is maximum
Show Answer
Answer:
Correct Answer: B
Solution:
- $ PE=-PE\cos \theta $ $ \tau =PE\sin \theta $ $ {\tau _{\max }} $ when $ \theta =90^{o} $ PE = 0
