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Electric Circuits

Electric Circuits
A current of 1 mA flows through a 1M ohm, 2 W carbon resistor. The power dissipated as heat in the resistor will be

 0.5 W.
None of these
 1 W.
 2 W.

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Electric Circuits
A 100 μF capacitor supplied from 3 V source with a frequency of 50 Hz. The capacitive reactance is

 63.68 Ω.
 31.84 Ω.
 15.92 Ω.
 7.96 Ω.

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Electric Circuits
The alternative names for active power is/are

 average power.
 true power.
 real power.
All of these

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Electric Circuits
Reactive power drawn by a pure resistor is

None of these
 0
 minimum
 maximum

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Electric Circuits
A parallel plate capacitor contain there dielectric layers of 1, 2 and 3 respectively and thickness of dielectric layers are 0.2 mm, 0.3 mm and 0.4 mm respectively. If area of plate is 20 cm2. What is the value of capacitance?

 36.6 pF.
 32 pF.
 None of them.
 30 pF.

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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.
  2.
 0.25.

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