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Electric Circuits

Electric Circuits
Voltage magnification will occur in which of the following case?

 Parallel resonance
 Series resonance
 Both
None of these

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Electric Circuits
Four capacitors each of 40 µF are connected in parallel, the equivalent capacitance of the system will be

 160 µF
 10 µF
 40 µF
 5 µF

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Electric Circuits
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then voltage across each resistor is

 doubled.
 increase by two times.
 halved.
 remain same.

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Electric Circuits
The capacitive reactance of an electric circuit is 50 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 25 Ohms.
 100 Ohms.
 200 Ohms.
 50 Ohms.

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Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 40.25.
 76.66.
 66.66.
 36.36.

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

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