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Whenever the magnet flux linked with a c...

Whenever the magnet flux linked with a coil changes, then is an induced emf in the circuit. This emf lasts

A

for ever

B

for a long time

C

for a short time

D

so long as the change in flux take place

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The correct Answer is:
D
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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 ) : Accroding to Faraday, the induced emf is inversely proportional to the rate of change of magnetic flux linked with a coil.

The magnetic flux linked with a coil is phi and the emf induced in it is e .

Assertion :- Whenever magnetic flux linked with the coil changes with respect to time, then an emf is induced in ti . Reason :- According to law , the direction of induced current in any coil in such a way that it always oposses the cause by which it is produced.

STATEMENT - 1 : Whenever there is a change in flux linked with a coil in a circuit, an induced current is set up in it. and STATEMENT - 2 : Whenever there is a change in flux linked with a coil in a circuit, an induced emf is set up in it.

The rate of change of magnetic flux linked with the coil is equal to the magnitude of induced e.m.f.' this is the statement of

What is the change in magnetic flux produced in a coil in 25 s, if the induced e.m.f. In the coil is 2 mV ?

Faraday's second law of EMI says that the magnitude of e.m.f. induced in a cuicuit is directly proportional to the rate of change of magnetic flux linked with circuit, i.e., e prop (d phi)/(dt) . It means if the magnetic flux linked with a circuit changes at a faster rate, the induced e.m.f. is larger and vice-versa. Read the above passage and answer the following question : (i) Coil A is held in a very strong magnetic field and coil B is held in a weak magnetic field. In which coil do you expect larger induced e.m.f. ? (ii) A coil is moved in a uniform magnetic field. When do you expect induced e.m.f. in the coil ? (iii) What values of life do you learn from Faraday's second law of EMI ?

The magnetic flux linked with the coil changes from 0.1 Wb to 0.04 Wb in 3 s. the emf induced in the coil is

NIKITA PUBLICATION-ELECTROMAGNETIC INDUCTION-MCQs
  1. The rate of change of magnetic flux linked with the coil is equal to t...

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  2. The magnitude of induced emf during electromagnetic induction, is dire...

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  3. Whenever the magnet flux linked with a coil changes, then is an induce...

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  4. The induced emf can be produced by changing

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  5. The magnitude of induced e.m.f. in a conductor, depends upon

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  6. Faraday's law are consequence of conservation

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  7. When a coil is rotated in a magnetic field, with steady speed, then

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  8. The induced emf produced when a magnet is inserted into a coil does no...

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  9. If a straight conductor is moved with a uniform velocity at right angl...

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  10. If a conductor is rotating about its one end in a uniform magnetic fie...

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  11. The direction of the induced e.m.f. is determined by

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  12. The phenomenon of electromagnetic induction was discovered by

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  13. Magnetic flux through a coil depends upon

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  14. If any surface is parallel to magnetic lines of forces, then magnetic ...

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  15. Negative sign appearing in Faraday's law of electromagnetic induction ...

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  16. A magnet is moved towards a coil (i) quickly (ii) slowly, then the ind...

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  17. A coil is being moved towards a stationary magnet (i) rapidly (ii) slo...

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  18. When a magnet is moved with its south pole towards the coil, then the ...

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  19. When a magnetic is moved with its N pole away from the coil, then the ...

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  20. Which of the following phenomenon makes use of electromagnetic inducti...

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