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Eddy currents are produced in a matteria...

Eddy currents are produced in a matterial when it is

A

heated

B

placed in a time varying magnetic field

C

placed in an electric field

D

placed in a unifrom magnetic field

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The correct Answer is:
B
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How eddy currents can be produced?

Assertion : A metallic surface is moved in and out in magnetic field then emf is induced in it. Reason : Eddy current will be produced in a metallic surface moving in and out of magnetic field.

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.

CP SINGH-ALTERNATING CURRENT-EXERCISES
  1. A choke coil has.

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  2. A choke coil is preferred to a resistance for reducing current in an a...

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  3. An electric lamp which runs at 80 volt d.c. and consumes 10 ampere is ...

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  4. In the circuit shown, R is a pure resistor, L is an inductor of neglig...

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  5. A capacitor and an inductor are connected in parallel across an ac sou...

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  6. In the given circuit the current drawn from the source is .

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  7. An inductor of 10mH an a capacitor of 16mF are connected in the circui...

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  8. The AC voltage across a resistance can be measured using

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  9. Alternating current can be measured by

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  10. Hot wire ammeters can be used for measuring

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  11. In the given circuit, the AC source has (omega) = 100 rad//s. Consider...

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  12. In a dc motor if E is the applied emf and e is the back emf then the e...

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  13. Armature current in dc motor will be maximum when

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  14. The armature of a dc motor has 20 Omega resistance It draws a currrent...

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  15. In a step - down transformer the input voltage is 22kV and the output ...

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  16. An ideal transformer is used to step up an alternating emf of 220V to ...

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  17. in a transformer the number of rurns in the primary and secondary coil...

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  18. in a step-up transformer, the turn ratio is 1:2 leclanche cell (e.m.f....

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  19. Eddy currents are produced in a matterial when it is

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  20. The core of any transformaer is laminated so as to

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