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PMMC instruments can be used as a fluxmeters by _______

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PMMC instruments can be used as a fluxmeters by _______

(a) Using a low resistance shunt

(b) Removing the control spring

(c) Making the control springs having a large moment of inertia

(d) Using a high resistance in series

I had been asked this question in homework.

Query is from Determination of the B/H Characteristic topic in portion Simple Magnetic Circuits of Basic Electrical Engineering

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Right option is (b) Removing the control spring

The best I can explain: A PMMC or a permanent moving magnet coil instrument can be used as a fluxmeter by removing the control spring.

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