Electric Circuits
Third pin of a 3 pin plug is thicker and longer

 for protection purpose.
 all pins are of same size.
 for designing purpose.
 none of these.

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Electric Circuits
A pole of driving point impedance is

 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.
 zero voltage for a finite value of driving voltage.

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