Magnetic Effects & Magnetism

JEE Main level, single correct, medium

270 of 276

Question 270 of 276

A magnetic dipole in a uniform magnetic field has: (Take zero potential energy when magnetic dipole is perpendicular to magnetic field)

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Answer: (B) Zero potential energy when the torque is maximum

Torque, τ=MBsin⁡θ\tau =MB\sin \theta

and potential energy, U=−MBcos⁡θU=-MB\cos \theta

τ\tau is maximum when θ=90o\theta ={90}^{o}

U=−MBcos⁡90o=0U=-MB\cos {90}^{o}=0.

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