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Electric Circuits

Electric Circuits
In active filter which element is absent?

 Capacitor.
 Both of above.
 Resistor.
 Inductor.

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Electric Circuits
A positive and a negative charged conductor are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

 25 times larger than before.
 5 times greater than before.
 10 times greater than before.
 5 times smaller than before.

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Electric Circuits
A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF.

 0.01C and 5W.
 0.01C, 10MW.
 0.1C, 100MW.
 0.1C, 10MW.

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Electric Circuits
Millman theorem yields equivalent

 impedance.
 voltage source.
 current source.
 both ‘c’ and ‘d’ .

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Electric Circuits
The rms value of the voltage U(t)= 3 + 4cos(3t)

  5 V.
 {3 + 2(1.141)} V.
 7 V.
  4.123 V.

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Electric Circuits
A 50 μF capacitor is charged to retain 10 MJ of energy by a constant charging current of 1 A. Determine the voltages across the capacitor?

 30 V.
 60 V.
 20 V.
 50 V.

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