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(A): For a practical choke coil the powe...

(A): For a practical choke coil the power factor is very small
(R): In a practical choke coil the power dissipation reduces if frequency of the a.c. is increased.

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

'A' is true and 'R' is false

D

Both 'A' and 'R' are false

Text Solution

Verified by Experts

The correct Answer is:
B
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A short - circuited coil is placed in a time varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the radius of the wire is to be halved, then find the electrical power dissipated.

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AAKASH SERIES-ALTERNATING CURRENT-EXERCISE - IB
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  10. (A) : The ammeter and voltmeters used for measuring alternating curren...

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  11. (A) : A series resonant circuit is also known as an acceptor circuit. ...

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  12. (A): For a practical choke coil the power factor is very small (R): ...

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  13. (A) : If a current has both ac and de components, then a dc ammeter us...

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  14. (A) : In series LCR circuit, the resonance occurs at one frequency onl...

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