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Electric Circuits

Electric Circuits
Time constant of RL series circuit is

 2RC
 L/R
 RC
 2L/R

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Electric Circuits
The switch S is the circuit shown in figure is ideal. If the switch is repeatedly closed for 1 ms and opened for 1 ms, the average value of i(t) is

 0.5 mA.
  0.25 mA.
 0.35 mA.
 1 mA.

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Electric Circuits
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

 2R Ω
 R Ω
 8R Ω
 4R Ω

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Electric Circuits
Two 1 kΩ, 1 W resistors are connected in series. Their combine resistance and wattage will be

 2 kΩ, 0.5 W.
 2 kΩ, 1 W.
 1 kΩ, 1 W.
 0.5 kΩ, 2 W.

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Electric Circuits
Current magnification will occur in which of the following case?

 Both
None of these
 Parallel resonance
 Series resonance

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Electric Circuits
If a capacitors of capacitance 100 μF is connected across a voltage source of 10 V, then what will be the energy stored in that capacitor?

 10 × 10 - 3 Joule.
 10 × 10 6 Joule.
 5 × 10 - 3 Joule.
 5 × 10 - 2 Joule.

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