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Faraday's Experiment

Explain why a...

Question

Explain why an induced current must flow in such a direction so as to oppose the change producing it.

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Solution

This is to ensure that some mechanical energy is spent in producing the change, which changes into the electrical energy in form of the induced current.

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Similar questions

Q. The direction of an induced electromotive force is always such as to oppose the cause that produces it. This is called :

Q. Assertion :The direction of induced emf is always such as to oppose the change that causes it. Reason: Conservation of energy applies to know the direction of induced emf.

Q. The given figure shows planar loops of different shapes moving out of or into a region of a magnetic field, which is directed normal to the plane of the loop away from the reader. Then the direction of induced current in each loop using Lenz's law will be

a). The magnetic flux through the rectangular loop abcd increases, due to the motion of the loop into the region of magnetic field. The induced current must flow along the path bcdab so that it opposes the increasing flux.

b) Due to the outward motion, magnetic flux through the triangular loop abc decreases due to which the induced current flows along bacb,
so as to oppose the change in flux.

c) As the magnetic flux decreases, due to motion of the irregular shaped loop abcd out of the region of magnetic field, the induced current flows
along cdabc, so as to oppose change in flux.

Note that there are no induced current as long as the loops are completely inside or outside the region of the magnetic field.
The correct statements are

Q. Assertion :An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current. Reason: Above statement is in accordance with conservation of energy.

Q. Read the following statements and answer whether the given statement is true or false.

Induced current will appear in such a direction that it opposes the change that produced it.

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Faraday's Experiment

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