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Question

A tester for detecting electric current utilizes some effect of electric current to detect its presence. Which of the following components can be used for this?


A

A light bulb

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B

An LED

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C

A magnetic compass

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D

All of these

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Solution

The correct option is D

All of these


All of these can be used to detect current. A light bulb and an LED will glow if current passes through it, and a magnetic compass needle will show a deflection if current flows through a wire in its proximity.


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