Electric Circuits
A pole of driving point impedance is

 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.
 zero current for a finite value of driving voltage.

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Electric Circuits
A certain network consists of large number of ideal linear resistances, one of which is designated as R and two constant ideal source. The power consumed by R is P1 when only the first source is active and P2 when only second source is active. In both sources are active simultaneously then the power consumed by R is

 P1 ± P2 .
 (√P1 ± √P2)2.
 √P1 ± √P2.
 (P1 ± P2 )2.

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Electric Circuits
Pure metal generally have

  high conductivity and low temperature coefficient.
  low conductivity and zero temperature coefficient.
  high conductivity and large temperature coefficient.
  low conductivity and high temperature coefficient.

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