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A 10 mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now show __________

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A 10 mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now show __________

(a) 10 mA

(b) 8 mA

(c) 2 mA

(d) Zero

I had been asked this question at a job interview.

Origin of the question is Advanced Problems on Indicating Instruments topic in division Extension of Instrument Ranges of Electrical Measurements

1 Answer

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Right option is (d) Zero

Easy explanation: The spring gives the controlling torque. It is connected in series with the coil. If the spring is cut open, there will be no deflection.

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