Electric Circuits
Three capacitors each of capacity C are given. The resultant capacity (2/3) C can obtained by using them

 all in parallel.
 all in series.
 two in parallel and third in series with this combination.
 two in series and third in parallel across this combination.

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Electric Circuits
A pole of driving point impedance is

 zero current for a finite value of driving voltage.
 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.

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