The torque and magnetic potential energy of a magnetic dipole in most stable position in a uniform magnetic field(¯B) having magnetic moment (¯m) will be.
A
−mB, zero
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B
mB, zero
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C
Zero, mB
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D
Zero, −mB
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Solution
The correct option is D Zero, −mB Torque, ¯τ=→m×→B=mBsinθ and magnetic potential energy Um=→m⋅→B=mBcosθ at θ=0o the dipole will be in most stable position τ=mBsinθ=mBsin0o=0 and Um=−mBcosθ=−mBcosθo=−mB