Electric Circuits
The delta equation of given star connected impedance ZQR is equal to

  (10 + j30) Ω.
 (20 + j10) Ω.
 (5 + j10 / 3) Ω.
 40 Ω.

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Electric Circuits
Pure metal generally have

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

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