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Lenz's Law

Which of the ...

Question

Which of the following statements can help you to determine the direction of induced current in Electromagnetic Induction?

A

Induced current flows such that it increase the total value of current

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B

Induced current flows such that it reduces the total value of current

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C

Induced current flows such that direction of magnetic field produced from induced current opposes change in external magnetic field

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D

Induced current flows such that direction of magnetic field produced from induced current opposes external magnetic field

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Solution

The correct option is D Induced current flows such that direction of magnetic field produced from induced current opposes change in external magnetic field
Lenz's Law states that the direction of an induced current is always such as to oppose the change in the circuit or the magnetic field that produces it. So according to this law, induced current flows to oppose the cause.

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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.

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

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. Consider a current carrying coil placed in a magnetic field. What are the requirements for induced current to flow as per electromagnetic induction.

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