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The coil of a moving coil voltmeter is 40 mm long, 30 mm wide, and has 100 turns. The control spring exerts a torque of 240 x 10-6 N-m when the deflection is 100 divisions on a full scale if the flux density of the magnetic field in the air gap is 1.0 Wb/m2. How can we modify the coil arrangement to give one volt per division? The resistance of the voltmeter coil may be neglected.
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