Electric Circuits
Atoms have no electric charge because they

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

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Electric Circuits
Pure metal generally have

  high conductivity and large temperature coefficient.
  low conductivity and zero temperature coefficient.
  low conductivity and high temperature coefficient.
  high conductivity and low temperature coefficient.

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