Electric Circuits
Three element having conductance G1, G2 and G3 are connected in parallel. Their combined conductance will be

 (1 / G1 + 1 / G2 + 1 / G3) - 1.
 1 / G1 + 1 / G2 + 1 / G3.
 (G1 + G2 + G3) - 1.
 G1 + G2 + G3.

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

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