Numerical- Current in voltage coil for given parameters of dynamometer wattmeter

Q.  For a dynamometer wattmeter, the variation of inductance with angular position of moving system is 0.06 mH/radian and spring constant is 10 X 10-6 N-m/radian. The current flowing in the instrument is 8 A. If the full scale deflection is 76 degree, then the current required in the voltage coil at full scale on d.c. circuit is
- Published on 05 Nov 15

a. 27.6 μA
b. 29.89 μA
c. 35.3 μA
d. 37.28 μA

ANSWER: 27.6 μA

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