JEE Main & Advanced
Physics
Magnetism
Question Bank
Self Evaluation Test - Magnetism and Matter
question_answer
A short bar magnet of magnetic moment \[0.4J\,{{T}^{-1}}\] is placed in a uniform magnetic field of\[0.16\,T\]. The magnet is in stable equilibrium when the potential energy is
A)\[-0.64J\]
B)zero
C)\[-0.082\,J\]
D)\[0.064\,J\]
Correct Answer:
D
Solution :
[d] For stable equilibrium \[U=-MB=-(0.4)(0.16)=-0.064\,J\]