You are given the task of inducing current in a circular coil(say A). For this you are provided with a strong bar magnet and another circular coil(say B), which carries a current of 'I' amperes. Which of the following will be a wrong way to induce current in the coil for longer time?

move pole of the bar magnet towards coil A

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move coil A towards pole of the bar magnet

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keep current carrying coil B near coil A

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move coil A towards current carrying coil B.

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Solution

The correct option is C
keep current carrying coil B near coil A

keeping a current carrying coil or even a bar magnet near the coil will not do any good because to induce current we need "changing” magnetic field. This phenomenon is known as electromagnetic induction.Keeping current carrying coil (B in this case) near the non current carrying coil (A in this case) will produce momentary current

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