Electric Circuits
Kirchhoffs laws are valid for

  non-linear circuits only.
  linear circuit only.
  both linear and non-linear circuits.
  passive time invariant circuits.

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Electric Circuits
Atoms have no electric charge because they

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

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