Current Loop — Stable PositionsHardQuestion 20232
Question
A current loop is placed in a non-uniform magnetic field. It will move toward:
- ARegions of weaker field always
- BRegions of stronger field if its moment is aligned with B
- CRegions of weaker field if its moment is anti-aligned with B
- DBoth B and C are correctCorrect
Correct answer
Both B and C are correct
Explanation
Energy U = −m·B. The loop moves to minimise U. If m is aligned (parallel to B), U = −mB is most negative in high-B regions → moves to stronger field. If m is anti-aligned, U = +mB is minimised in low-B regions → moves toward weaker field.