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Electric Circuits

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

 0.020.
 6.24.
 3.12.
 1.56.

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Electric Circuits
A 2m long conductor, carries a current of 50 A at a magnetic field of 100 × 10 − 3 T. The force on the conductor is

 100 N.
 10000 N.
 10 N.
 1000 N.

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Electric Circuits
In the given figure the value of the source voltage is

 12 V.
 24 V.
 44 V.
 30 V.

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Electric Circuits
Kirchhoffs laws are valid for

  both linear and non-linear circuits.
  non-linear circuits only.
  passive time invariant circuits.
  linear circuit only.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit increase if frequency of voltage source increases?

 VL and VR.
 VL and Z.
 VL and I.
 Z and I.

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Electric Circuits
The rms value of the resultant current in a wire which carries a DC current of 10A and a sinusoidal current of peak value 20A is

 14.14A.
 30A.
 17.3A .
 22.4A.

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