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Question

A tester for detecting electric current utilizes some effect of electricity to detect its presence, which of the following can be used for this?

A
Light bulb
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B
Magnetic compass
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C
Buzzer
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D
Fuse wire
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Solution

The correct option is C Buzzer
A light bulb will glow if current passes through it.
A magnetic compass needle will show a deflection if a current flows through a wire near it.
A buzzer produces sound when current passes through it.
Fuse wire heats on passing of electric current but shows no observable indication for flow of current.

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