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A rectangular coil of dimensions 4.50 cm by 6.40 cm consists of 20 turns of wire and carries a current of 15.0 mA. A 0.450-T magnetic-field is applied parallel to the plane of the coil.
Find the magnitude of the magnetic dipole moment of the coil.
What is the magnitude of the torque acting on the loop?
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A) The magnetic dipole moment(Ucoil?) =N* I*A (It is a vector pointing in the direction of A)

=  20 *15 x10-3 * ( 4.50 *10-2 x 6.40 *10-2)

Ucoil? = 8.64 * 10-4 A - m2

B)  Magnitude of the torque acting on the loop = Ucoil * B

=   8.64 * 10-4 * 0.450

= 3.88* 10-4 N.m
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