NEET 2011 Physics question
Not in JEE Advanced syllabus
A short bar magnet of magnetic moment is placed in a uniform magnetic field of . The magnet is in stable equilibrium when the potential energy is :
Answer: (1)
Solution
The potential energy of a magnetic dipole in a uniform field is . Stable equilibrium occurs when the moment is parallel to the field (), where is minimum: $U = -MB = -(0.4)(0.16) = -0.064\
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