Electric Circuits
What will be the capacitance when distance between the 2 plates of a condenser of capacitance 8 micro farad is reduced from 10 mm to 4 mm?

 8 microfarad.
 1 microfarad.
 20 microfarad.
 3.2 microfarad.

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

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