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Electric Circuits

Electric Circuits
Which of following materials has the least resistivity ?

  Copper.
  Lead.
  Mercury.
  Zinc.

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Electric Circuits
For ideal tank circuit, what is the value of dynamic admittance?

 0
 Both
 ∞
None of these

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

 4.
 1/4.
 1.
 16.

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Electric Circuits
The unit of electric field intensity is

 F / m.
 N / C.
 F/ m2.
 N / Ampere.

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Electric Circuits
The active and reactive power in an AC circuit are 10W and 20VAR respectively. What is the power factor?

 0.577.
 0.5.
 0.866.
 1.

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Electric Circuits
If the length of a wire of resistance R is uniformly stretched to n times its original value, what will be its new resistance

  R / n2.
  n2R.
  n2 / R.
  nR .

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