Electric Circuits
The current in a chemical cell is a movement of

 positive hole charges.
  negative ions only.
  positive ions only.
  positive and negative ions.

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Electric Circuits
A pole of driving point impedance is

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

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