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The resistance of a coil for direct curr...

The resistance of a coil for direct current is 10 ohm. When a.c. is sent through the same coil, its resistance would be

A

`10 Omega`

B

`gt 10 ohm`

C

`lt 10 ohm`

D

cannot say

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The correct Answer is:
B
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PRADEEP-ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT-Exercise
  1. The peak value of 220 a.c. is

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  2. Phase difference between voltages across L and C in series is

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  3. The resistance of a coil for direct current is 10 ohm. When a.c. is se...

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  4. The average value of a.c. voltge E =E(0) sin omega t over the time int...

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  5. The alternating current from a source is represented by I = 0.5 sin 31...

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  6. Q factor of resonance is given by

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  7. The power factor of an a.c. circuit is givne by cos phi =

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  8. The…………… of alternating current varies …………………….. With time and its………...

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  9. Ordinary d.c. ammerter and d.c. votmeter, when used in ………………….record…...

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  10. The r.m.s. value or………………………value or ………………….value of a.c. is ……………………...

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  11. 220 V a.c. means…………………… and an a.c. of 1 A means…………………….

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  12. In an a.c. circuit containing R only…………………and…………………are in ………………..ph...

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  13. In an a.c. circuit containing L only, alternating current………………….alter...

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  14. The dimensions of inductvie………………………and ……………….are the same as those o...

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  15. A consdenser ………………….a.c. to pass through but…………………….d.c.

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  16. Ohmic resistance R can reduce ………………..but indcutor L can reduce………………....

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  17. A series resonance circuit is called an ……………..and a……………………is called ...

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  18. A capacitor is 5 mu F is conneted to 20 V supply through a resistance ...

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  19. A coil of resistance 20Omega and inductance 0.5H is switched to DC200V...

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  20. An inductor (L = 20 mH), a resistor (R = 100 Omega) and a battery(vare...

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