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Electric Circuits

Electric Circuits
Consider the following circuit. What is the value of current I in the 5 Ω resistor in the circuit given in the figure?

 3 A.
 2 A.
 0 A.
 4 A.

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Electric Circuits
Which of the following may be the value of resistivity of copper at absolute zero in ohm-metre?

 0.020.
 1.56.
 6.24.
 3.12.

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Electric Circuits
The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be

 107.14 rpm in reverse direction.
 5250 rpm in forward direction.
 107.14 rpm in forward direction.
 5250 rpm in reverse direction.

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Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 80 times per second.
 120 times per second.
 70 times per second.
 60 times per second.

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Electric Circuits
A parallel plate capacitor with air as dielectric, force between plate is F. If capacitor is now immersed water of dielectric εr, force between plate will be –

 F εr.
 εr/F.
 F.
 0.

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Electric Circuits
If 1 A current flows in a circuit, the number of electrons flowing through this circuit is

 0.625 × 1019
 1.6 × 1019
 1.6 × 10 - 19
 0.625 × 10 - 19

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