A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?(a) 0.0216 N-m(b) 0.0456 N-m(c) 0.1448 N-m(d) 1 N-mI had been asked this question in unit test.My question is taken from Advanced Problems on Indicating Instruments in portion Extension of Instrument Ranges of Electrical Measurements

A moving coil of a meter has 250 turns and a length and depth of 40 mm

1.	A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?(a) 0.0216 N-m(b) 0.0456 N-m(c) 0.1448 N-m(d) 1 N-mI had been asked this question in unit test.My question is taken from Advanced Problems on Indicating Instruments in portion Extension of Instrument Ranges of Electrical Measurements
Answer» The correct OPTION is (a) 0.0216 N-m Explanation: Given, N = 250, L = 40 × 10^-3, d = 30 × 10^-3m, I = 160 × 10^-3A, B = 450 × 10^-3 T Torque = 250 × 450 × 10^-3 × 40 × 10^-3 × 30 × 10^-3 × 160 × 10^-3 = 200 × 10^-6N-m = 0.0216 N-m.

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