Electric Circuits
A pole of driving point impedance is

 zero current for a finite value of driving voltage.
 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.

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Electric Circuits
The voltage induced in an inductor is represented as,

 ratio of its inductance to current through it.
 product of its inductance and current through it.
 ratio of current through it to its inductance.
 product of its inductance and rate of change of current through it.

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