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Electric Circuits

Electric Circuits
In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?

 4 msec
 1 μsec
 2 μsec
 2 msec

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Electric Circuits
A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

 initially.
 when capacitor is fully charged.
 when capacitor is half charged.
 when capacitor is almost 25% charged.

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Electric Circuits
A capacitor carries a charge of 0.3 C at 20 V. Its capacitance is

 1.5 μF.
 15 μF.
 1.5 F.
 0.015 F.

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Electric Circuits
Current efficiency in electroplating is usually

  50 to 60 %.
  99 %.
  70 to 80 %.
  90 to 98 %.

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Electric Circuits
A wire of 0.14 mm diameter and specific resistance 9.6 Ω - cm is 440 cm long. The resistance of the wire will be

 27.4 Ω.
 9.6 Ω.
 11.3 Ω.
 13.7 Ω.

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Electric Circuits
Which field is associated with the capacitor?

 Magnetic.
 Electric.
 Both of (A) and (B).
 None of above.

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