1) You have a wire of length L = 2.1 m for making a square coil of a dc motor. The current in the coil is I = 1.7 A, and the magnetic field of the motor has a magnitude of B = 0.35 T. Find the maximum torque exerted on the coil when the wire is used to make (a) a single-turn square coil and (b) a two-turn square coil.
ANSWERS: A) 0.16399 N*m
B)??????????????????
ANSWERS: A) 0.16399 N*m
B)??????????????????
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(L/2)/4=L/8=Length of a side of a square
Area=(L/8)^2=L^2/64
Magnetic Moment = 2*Area*I
Torque Max = Magnetic Moment X B = 2*(L^2/64)*I*B= (1/32) I*B*L^2 = 0.082 N*m
Area=(L/8)^2=L^2/64
Magnetic Moment = 2*Area*I
Torque Max = Magnetic Moment X B = 2*(L^2/64)*I*B= (1/32) I*B*L^2 = 0.082 N*m