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A circular coil consists of N = 495 closely winded turns of wire and has a radius R = 0.75 m. A counterclockwise current I = 2.1 A is in the coil. The coil is set in a magnetic field of magnitude B = 1.4 T. The magnetic field points to right.

1632_A circular coil closely winded turns of wire.png

Express the magnetic dipole moment μ in terms of the number of the turns N, the current I, and radius R.

Which direction does μ go?

If the magnetic field was pointing upward, express the potential energy of the coil in the magnetic field,U_u, in terms of μ and B.

WhatAc€?cs the torque τ_u now?

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