Electric Circuits
A current of 4 A flows in an ac circuit when 100 V dc is applied to it whereas it takes 250 v ac to produce the same current the power factor of the circuit is

 10.
 0.4.
 0.85.
 1.

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Electric Circuits
Atoms have no electric charge because they

 have an equal number of charged and non charged particles.
 have neutrons in their nuclei.
 have an equal number of electrons and protons.
 have an equal number of neutrons and protons.

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