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# the law which gives the polarity of induced emf in electromagnetic induction is

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## Which of the following laws gives the direction of induced emf?

Which of the following laws gives the direction of induced emf?

Which of the ... Question

Which of the following laws gives the direction of induced emf?

A Lenz's law B

Fleming's left-hand rule

C Ohm's law D

Open in App Solution

The correct option is A

Lenz's law

Explanation for the correct option: option A. Lenz's law:

Lenz’s law states that the polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it.

Lenz's law predicts the direction of an e.m.f. caused by a changing magnetic field through a wire loop or coil.

To establish current flow, the external source of the electromagnetic field must perform some work to overcome this opposition.

Mathematically, it can be expressed as

E=-Ndϕdt , where dϕ

is the change in magnetic flux,

dt

is the change in time,

N

is the number of loops, and

E is the induced emf.

The negative sign in the formula represents this effect. Thus, the negative sign indicates that the direction of the induced emf and the change in the direction of magnetic fields have opposite signs.

Electromagnetic brakes and induction cooktops use Lenz's law. It is also used in electric generators and alternating current generators.

An illustrative diagram to show the direction of induced emf is given below.

Hence, option (A) is correct.

Explanation for the incorrect options:

According to Fleming's left-hand rule, if we place our thumb, forefinger, and middle finger of the left-hand perpendicular to each other, the thumb points toward the magnetic force, the forefinger points towards the magnetic field, and the middle finger points towards the current direction.

Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.

Faraday’s laws of electromagnetic induction consist of two laws. The first law describes the induction of emf in a conductor and the second law quantifies the emf produced in the conductor.

Here, options (B), (C), and (D) are incorrect.

Hence, option (A) is correct.

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SIMILAR QUESTIONS

Q.

Which of the following law's gives the direction of induced emf?

Q.

Which of the following instruments uses the phenomenon of induced EMF?

Q. The direction of induced current or the polarity of induced emf can be found byQ. Name the rule which gives the direction of induced current.Q. Name the law which gives polarity of induced emf.

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## State the law that gives the polarity of the induced emf.

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## State the law that gives the polarity of the induced emf.

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Updated on : 2022-09-05

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## Lenz's Law. The polarity of induced emf is such that it tends to produced a current which opposes the change in magnetic flux that produces it.

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## Sate the law gives the polarity of the induced emf.

Lenz's law the polarity of the induced emf is such that it tends to produce current which oppose the change in magnetic flux that produces it.

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Electromagnetic Induction And Alternating Current

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Sate the law gives the polarit...

Sate the law gives the polarity of the induced emf.

Updated On: 27-06-2022

Lenz's law the polarity of the induced emf is such that it tends to produce current which oppose the change in magnetic flux that produces it.

Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

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