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Magnetic Flux Density

If a bar magn...

Question

If a bar magnet is moved to and fro near a copper coil then _____________.

A

the coil will undergo a chemical reaction

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B

the current is induced in the coil

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C

Both (a) and (b)

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D

None of these

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Solution

The correct option is B
the current is induced in the coil

The to and fro motion will change the flux density of the coil and hence a current will be induced in the coil (electromagnetic induction). As there is no rearrangement of the molecular or ionic structure of a substance there won't be any chemical reaction.

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Similar questions

Q. The following diagram in figure shows a coil of several turns of copper wire near a magnet NS. The coil is moved in the direction of arrow show in the diagram. In what direction does the induced current in coil flow?

Q. (a) Two circular coils A and B are placed closed to each other. If the current in the coil A is changed will some current be induced in the coil B? Give reason?
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