The magnetic potential energy when a bar magnet of magnetic moment m⃗ is placed perpendicular to the magnetic field B⃗ is:
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The magnetic potential energy when a bar magnet of magnetic moment m⃗ is placed perpendicular to the magnetic field B⃗ is:

G1 Physics · Accepted Answer

Step 1: The potential energy of a magnetic dipole is U = −m⃗·B⃗ = −mB cosθ. Step 2: For perpendicular orientation θ = 90° and cos90° = 0. Step 3: U = 0. Correct answer B. Final answer: (B) zero.