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Equivalent Voltmeter and Ammeter

A 0-10 mA PMM...

Question

A (0-10) mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now read nearly

A

10 mA

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B

8 mA

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C

2 mA

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D

zero

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Solution

The correct option is D zero
The current though coil will be zero, because in PMMC type instruments control spring is connected in series with the moving coil.

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