Question

What is the need to use magnetic compass to test conduction of electric current?

Answer 1

Sometimes the bulb does not glow on passing electric current. This is because the electric current flowing through a conductor is so small, that the filament of the bulb does not get heated up to the temperature where it starts glowing. So, in case of small current we need magnetic compass to test the conduction.

Answer 2

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We need a magnetic compass to test the conduction of electric current because the magnetic compass will get deflected even if there is a small value of current. Sometimes the bulb does not glow on passing electric current.

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