A device used for detecting small currents due to changing magnetic field is known as:

Galvanometer

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Ammeter

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Voltmeter

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Potentiometer

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Solution

The correct option is B Galvanometer
Galvanometer is used to detect small current changes. By adding resistors, it can be converted into an ammeter or a voltmeter. Potentiometer is used to measure resistance of a resistor or voltage of a battery.

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The device which can be used to detect very small current flowing in an electric circuit is :
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