Electric Circuits
Atoms have no electric charge because they

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

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Electric Circuits
A certain network consists of large number of ideal linear resistances, one of which is designated as R and two constant ideal source. The power consumed by R is P1 when only the first source is active and P2 when only second source is active. In both sources are active simultaneously then the power consumed by R is

 (√P1 ± √P2)2.
 (P1 ± P2 )2.
 √P1 ± √P2.
 P1 ± P2 .

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