Electric Circuits
Two battery having unequal emf

 both a and d
 cannot be connected in parallel.
 cannot be connected in series.
 can be connected in series only.

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

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