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Electric Circuits

Electric Circuits
A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

 500 ohms.
 5000 ohms.
 50 ohms.
 1000 ohms.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The voltage drop across L is

  31.9 V.
  39.1 V.
 50.5 V.
 45.5 V.

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Electric Circuits
KVL works on the principle of

None of these
 both.
 law of conservation of energy.
 law of conservation of charge.

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Electric Circuits
The ratio of the resistance of a 200 W, 230 V lamp to that of a 100 W, 115 V lamp will be

 4.
  0.5.
 0.25.
  2.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 50 Ohms.
 400 Ohms.
 200 Ohms.
 100 Ohms.

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Electric Circuits
Given network is having N nodes and B branches, then number of twigs are

 N.
 B - N - 1.
 B - N + 1.
 N - 1.

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