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Does the change in magnetic flux always ...

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

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Induced emf is produced always but induced current is produced only when the circuit is closed.
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(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 dI/Dt (iii) Magnetic potential energy stored versus the current.

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Assertion : If a varying current is flowing through a machine of iron, eddy currents are produced. Reason : change in the magnetic flux thro' an area causes eddy currents.

MODERN PUBLICATION-ELECTROMAGNETIC INDUCTION-REVISION EXERCISE (Very Short Answer Questions Carrying I mark)
  1. What is the basic cause of induced e.m.f. ?

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

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

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

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

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

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

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

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

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

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

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  12. What is the relation between weber and Maxwell ?

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

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

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

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

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

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

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

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  20. What is the power required to move a conductor of length l having resi...

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