Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

 ω σ/ε.
 ω ε/σ.
  σ/ω ε.
 σ ω ε.

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Electric Circuits
What is time period T?

 Time taken by an alternating quantity to complete the (+)ve half.
 Time taken by an alternating quantity to reach the peak value.
 Time taken by an alternating quantity to complete the (-)ve half.
 Time taken by an alternating quantity to complete one full cycle.

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Electric Circuits
Pure metal generally have

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

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