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Why induced emf is called back emf?...

Why induced emf is called back emf?

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What is back emf?

What is induced e.m.f.?

The current in a coil changes from 0 to 20 A in 0.5S. If the induced emf is 80V, the self inductance of the coil is

Define mutual inductance. Derive formula for the induced e.m.f. in the coil due to mutual inductance.

Whenever the magnetic flux linked with a coil changes,then an induced e.m.f. is produced in the circuit. This e. m. f. lasts

The current in one coil increasesfrom0 to 500 mA in 0.1 ms. The induced emf in the second coil is 500 V. Calculate the mutual inductance between the two coils.

If the rate of change of current in primary coil is doubled,the induced e.m.f. in secondary coil will become

The current in the coil changes from 3A to 6 A in 3sec. If the induced e.m.f. in the coil is 60 V, then self inductance of the coil is

The self inductance of a coil is 5 H, a current of 1 A change to 2 A within 5 second through the coil. The value of induced e.m.f. will be

A current through a coil of self inductance 10 mH increases from 0 to 1 A in 0.1 s. What is the induced emf in the coil?

CHETANA PUBLICATION-Electromagnetic Induction-EXERCISE
  1. To induce an e.m.f. in a coil, the magnetic flux

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  2. The co-efficient of self induction of a coil is the ratio of

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  3. The S.I. unit of inductance Henry can be written as

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  4. The number of turns in primary and secondary coil of transformer are 1...

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  5. Lenz's law is in accordance with law of conservation of

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  6. Magnetic flux associated with area element ds kept in magnetic inducti...

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  7. Induced e.m.f. produced in the coil is 4mV. What is the change in flux...

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  8. Foucault's current is also

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  9. What is SI unit of magnetic flux density?

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  10. Why induced emf is called back emf?

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  11. What is SI unit of self inductance?

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  12. Write a short note on generator.

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  13. State Faraday's laws of electromagnetic induction.

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  14. A straight conductor is moving with a velocity of 18 km//hr at right a...

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  15. The primary of transformer has 5000 turns and works on 400V and 100 Wa...

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  16. Define mutual induction state its unit and dimension

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  17. What are eddy currents? State applications of eddy currents?

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  18. Explain why the inductance of two coils connected in parallel is less ...

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  19. The value of mutual inductance of two coils is B 10 mH. If the current...

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  20. Derive the expression for self inductance of a solenoid.

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