Electric Circuits
A pole of driving point impedance is

 zero voltage for a finite value of driving current.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.
 zero current for a finite value of driving voltage.

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

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