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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Electric Circuits
A battery of E Volts is supplying a steady current to a series circuit of total resistance RΩ and inductance L Henry. A part R1 of the total resistance is suddenly short circuited. Find the expression for current flowing through the battery subsequent to the operation.

 i = {E / (R - R1)}[1-(R1 / R) *e- {(R - R1 )t/L}
 i = {E / R}[1-(R1 / R) *e - {(R - R1 )*t/L}
None of these
 i = {E / R1 - R)}(1- e - (R1 - R) t / L)

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of peak quantity at any instant.
 The value of alternating quantity at any instant.
 The value of peak current at any instant.
 The value of alternating frequency at any instant.

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