Electric Circuits
Advantage of active filter is

  derive high impedance load.
  both of above.
  do not offer gain.
  easy to tune.

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

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