You have a wire of length L = 0.9m for making a square coil of a dc motor. The c

Question

You have a wire of length L = 0.9m for making a square coil of a dc motor. The currentin the coil is I = 2.1 A, and themagnetic field of the motor has a magnitudeof B = 0.21 T. Find the maximumtorque exerted on the coil when the wire is used tomake (a) a single-turn square coiland (b) a two-turn square coil.
(a) max = N*mNkg*m^2C/sT (b) max = Nkg*m^2N*mC/sT


(a) max = N*mNkg*m^2C/sT (b) max = Nkg*m^2N*mC/sT

(a) max = N*mNkg*m^2C/sT (b) max = Nkg*m^2N*mC/sT

Explanation / Answer

Area of the loop A = 0.050625 m2                            i = 2.1 A                            B = 0.21 T a) = NiAB sin       For maximum torque = 90     ==> = N i A B     When N = 1              = i A B = 2.1 * 0.050625 * 0.21 = 2.232 x 10-2N-m b) When N = 2             = 4.465 x 10-2 N-m

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