A uniform magnetic field B of 0 .3 T is along the positive Z -direction. A rectangular loop ( a b c d ) of sides 10 cm × 5 cm carries a current I of 12 A . Out of the following different orientations

Question

A uniform magnetic field B of 0 .3 T is along the positive Z -direction. A rectangular loop ( a b c d ) of sides 10 cm × 5 cm carries a current I of 12 A . Out of the following different orientations which one corresponds to stable equilibrium?

TestHub · Accepted Answer

U = - M → · B → = - M B cos θ For stable equilibrium potential energy should be minimum and τ = 0 U m i n = - M B when θ = 0 ° ⇒ cos ⁡ θ = 1 ⇒ M → and B → are on same direction.

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