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The induced e.m.f. is sometimes called ...

The induced e.m.f. is sometimes called back e.m.f. Why ?

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Because it always opposes the rate of change of fiux
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MODERN PUBLICATION-ELECTROMAGNETIC INDUCTION-REVISION EXERCISE (Very Short Answer Questions Carrying I mark)
  1. How current can be induced in a coil C due to another coil C'?

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  2. What is the basic cause of induced e.m.f. ?

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  3. The induced e.m.f. is sometimes called back e.m.f. Why ?

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  4. Does the change in magnetic flux always produce both emf and current?

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  5. A vertical matallic pole falls down through the plane of magnetic meri...

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  6. Two identical loops, one of copper and other of manganin, are removed ...

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  7. What will be the magnitude of induced emf in a rectangular loop ABCD, ...

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  8. Predict the polarity of the capacitor in the situation described below...

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  9. Use Lenz's law to determine the direction of the induced current when ...

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  10. The electric current flowing in a wire in the direction from B to A de...

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  11. What do you mean by magnetic flux through a surface?

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  12. A long straight current carrying wire passes normally through the c...

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  13. What is the relation between weber and Maxwell ?

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  14. Predict the direction of induced current in metal rings 1 and 2 when c...

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  15. Volt-sec is the unit of which physical quantity?

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  16. State Lenz's law of electromagnetic induction. The magnetic threading ...

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  17. When the north pole of a magnet is moved away from a coil, what is the...

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  18. Why a spark is produced in a switch sometimes when it is switched off?

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  19. Derive the expression for motional emf induced in a conductor moving i...

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  20. Define self-inductance of a coil. Obtain the expression for the energy...

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