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The magnetic potential energy, when a magnetic bar of magnetic moment ⃗m is placed perpendicular to the magnetic field ⃗B, is

Asked in NEET 2024 Re-exam · Dipole in a uniform field

Answer: (2) Zero

Step-by-step solution

Given: the moment ⃗m is perpendicular to ⃗B, so θ=90°.

Idea: the potential energy of a dipole in a uniform field is U=-⃗m·⃗B=-mB cos θ.

U=-mB cos 90°.

cos 90°=0, so U=0.

The perpendicular position is the zero of this energy scale, midway between -mB and +mB.

Why the other options are wrong

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