Question

how can you use compass to detect the presence of current in a wire​

Answer 1

Answer:

In presence of electricity it will point in random direction .

Explanation:

Actually electricity produce magnetic field and compass is also working on the basis of magnetic field of the earth and it's own so when any other magnetic field line enters it shows random direction .

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Answer 2

Magnetic Fields
Give evidence for the existence of a magnetic field near a current carrying wire. If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.