Electric Circuits
Third pin of a 3 pin plug is thicker and longer

 all pins are of same size.
 for designing purpose.
 none of these.
 for protection purpose.

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Electric Circuits
Atoms have no electric charge because they

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

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