Electric Circuits
The internal resistance of a practical voltage source is considered to be connected in

 parallel.
 series.
None of these
 either parallel or series.

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Electric Circuits
A pole of driving point impedance is

 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.
 zero voltage for a finite value of driving current.

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