Electric Circuits
Image impedance can be written by using short circuit impedance(Zsc)and open circuit impedance(Zoc) as

 Zsc+Zoc
  (Zsc . Zoc)½
 Zsc/Zoc
 Zsc-Zoc

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Electric Circuits
Pure metal generally have

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

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