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Induced Current and Induced emf

According to ...

Question

According to the faraday's laws of electro magnetic induction-

A

The direction of the induced current is such that it opposes it self.

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B

The induced emf in the coil is equal to the rate of change of magnetic flux associated with it.

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C

The direction of induced emf is such that it opposes self.

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D

None of the above

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Solution

The correct option is B The induced emf in the coil is equal to the rate of change of magnetic flux associated with it.

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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. (a) Describe a simple experiment (or activity) to show that the polarity of emf induced in a coil is always such that it tends to produce a current which opposes the change of magnetic flux that produces it.
(b) The current flowing through an inductor of self inductance

L

is continuously increasing. Plot a graph showing the variation of
(i) Magnetic flux versus the current
(ii) Induced emf versus

d l / d t

(iii) Magnetic potential energy stored versus the current.

Q. Assertion (A): Whenever the magnetic flux linked with a closed coil changes there will be an induced emf as well as an induced current.
Reason (R): According to Faraday, the induced emf is inversely proportional to the rate of change of magnetic flux linked with a coil.

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. According to Lenz's law, the induced current in the coil will appear in a direction such that it supports the change in the magnetic flux in the coil.

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