A tester to detect weak currents should use

Magnetic needle

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Bulb

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Bell

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All of the above

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Solution

The correct option is A
Magnetic needle

A magnetic needle deflects at small currents also, so it should be used.

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A tester to detect weak currents should use

The correct option is A Magnetic needle A magnetic needle deflects at small currents also, so it should be used.

The correct option is A
Magnetic needle

A magnetic needle deflects at small currents also, so it should be used.