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Electric Circuits

Electric Circuits
The electrical conductivity of metal is typically of the order of (in ohm - m)

 10 - 4.
 107.
 105.
 10 - 6.

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Electric Circuits
Millman theorem yields equivalent

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

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Electric Circuits
The coils having self inductor of 10 mH and 15 mH have an effective inductor of 40 mH, when connected in series aiding. What will be the equivalent inductor if we connect them in series opposing

 20 mH.
 0 mH.
 5 mH.
 10 mH.

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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

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

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Electric Circuits
For same voltage, the ratio resistance of 100 W lamp to resistance of 25 W lamp is

 1/4.
 1.
 16.
 4.

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Electric Circuits
A variable capacitance is one whose capacitance

 can be changed manually or by mechanical force.
 changes with time.
 changes with temperature.
 changes with voltage.

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MORE MCQ ON Electric Circuits

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