Question: A certain fixed length L of wire carries a current I. (a) Show that if the wire is formed into a square coil, then the

A certain fixed length L of wire carries a current I.
(a) Show that if the wire is formed into a square coil, then the maximum torque in a given magnetic field B is developed when the coil has just one turn.
(b) Show that the magnitude of this torque is τ = 1/16 L2IB.

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