Electric Circuits
When AC flows through a pure capacitance then the current

 leads the emf by 90o.
 lags the emf by 90o.
 leads the emf by - 90o.
 is in phase with emf.

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Electric Circuits
Pure metal generally have

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

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