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Electric Circuits

Electric Circuits
In the circuit given, I = 1 A for Is = 0. What is the value of I for Is = 2 A ?

 1 A.
 3 A.
  2 A.
 4 A.

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Electric Circuits
If the dielectric of a capacitor is replaced by conducting material

 the capacitance value of the plate will decrease.
 the plate will get short circuited.
 the capacitor can store infinite charge.
 the capacitor will get heated up due to eddy currents.

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Electric Circuits
A capacitor has a capacitance of 6 μF. Calculate the stored energy in it if a DC voltage of 100 V, is applied across it?

 2.5 × 102 joules.
 6 × 102 joules.
 4 × 102 joules.
 3 × 102 joules.

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Electric Circuits
For balanced star load, if unbalanced line current are IR, IY, IB equal to - j10, - j10 and - j20 respectively, the neutral current will be equal to

  (8.66 - j5) A.
  (-8.66 - j5) A.
  (-9.66 + j5) A.
  (8.66 + j5) A.

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Electric Circuits
If emf in a given circuit is given by e = 100 sinω0t, then maximum value of voltage and frequency will be

 100 V, 50 Hz.
 50√2 V, 100 Hz.
 100√2 V, 100 Hz.
 100 V, 100 Hz.

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Electric Circuits
Which of the following represents the resonance frequency (ω0) with respect to lower cutoff frequency (ω1) and higher cutoff frequency (ω2)

 ω1 / ω2
 ω1 + ω2
 √(ω1² + ω2²)
 ω1 - ω2

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