Electric Circuits
Advantage of active filter is

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

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

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