Electric Circuits
One atomic mass unit ( amu ) is approximately equal to

  1.6 × 10-27 Kg.
 1.6 × 10-19 Kg.
 1.6 × 10-24 Kg.
 1.6 × 10-13 Kg.

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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.

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

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Electric Circuits
A pole of driving point impedance is

 zero voltage for a finite value of driving current.
 zero current for a finite value of driving voltage.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.

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