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moving-coil instrument, used as a voltmeter, has a coil of 150 turns with a width of...

moving-coil instrument, used as a voltmeter, has a coil of 150 turns with a width of 3 cm and an active length of 3 cm. The gap flux density is 0.15 T. If the full-scale reading is 150 V and the total resistance of the instrument is 100 000 Ω, find the torque exerted by the control springs at full scale.


coil of a moving-coil instrument is wound with 40 turns. The mean width of the coil is 4 cm and the axial length of the magnetic field is 5 cm. If the flux density in the gap is 0.1 T, calculate the torque in N m when the coil is carrying a current of 10 mA.
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