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In which of the following devices, the e...

In which of the following devices, the eddy current effect is not used ?

A

Magnetic breaks

B

speedometers

C

Induction furnace

D

Transformers

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The correct Answer is:
D
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PRADEEP-ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT-Exercise
  1. Choose the wrong statement :

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  2. Amount of charge inuduced in a circuit of resistance R is given by

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  3. In which of the following devices, the eddy current effect is not used...

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  4. Out of the following choose the correct relation

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  5. When number of turns of a solenoid is doulbed, its self inductance bec...

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  6. The magnetic flux linked with a coil is phi = (3 t^(2) - 2 t + 1) mill...

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  7. A wire of length 2 m moves with a speed of 5 m//s perdendicular to a m...

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  8. One weber is the amount of ……………………over an area of ……………………….. Held no...

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  9. An e.m.f. is induced in a coil when ……………………. Linked with the coil ………...

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  10. The magnetic of ………………..in a circuit is …………..to the……………………linked wit...

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  11. According to …………………law, the polarity of ………………………is such that it……………...

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  12. Lenz's law is consequence of the law of conservation of

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  13. Eddy curents are the current …………………….when …………………….changes.

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  14. If omega is angular frequency of a.c., then the reactance offered by i...

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  15. Self induction of a coil is said to be…………….. When a current change………...

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  16. Self inductance of a solenoid varies……………………as the ………………of the number...

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  17. Coefficient of mutual inductance of two coil is numerically …………………lin...

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  18. A coil with an average diameter of 0.02 m is placed perpendicular to a...

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  19. An air cored solenoid of length 50 cm and area of cross section 20 m^(...

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  20. A magnetic field of flux density 1.0 Wb m^(-2) acts normal to a 80 tur...

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