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Electric Circuits

Electric Circuits
A voltage of v = 100 sin (wt + π/3) is applied to pure resistor of 30 Ohm. What is the RMS value of current is

 4.71.
 2.36.
 5.77.
 1.92.

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Electric Circuits
Mica capacitor are characterised by all of following except

 accurate value.
 low leakage reactance.
 low losses.
 stable operation.

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Electric Circuits
The capacitance of a conductor is varying from 2 microfarad to zero in 1 sec linearly if the voltage applied to it is 6 V the energy stored in 0.5 sec in the condenser is

 20 µ joules.
 10 µ joules.
 18 µ joules.
  55.1 µ joules.

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Electric Circuits
Which of the following materials has highest electrical conductivity ?

  Copper.
  Silver.
  Aluminium.
  Steel.

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Electric Circuits
Which field is associated with the capacitor?

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

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Electric Circuits
An ac voltage source v = vo sinωt is connected across a parallel plate capacitor C. If the conductor current is ic and the displacement current is id, then which is true among following relation

 ic < id.
 ic = id.
 ic > id.
 ic + id = 0.

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