Electric Circuits
In balanced bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This can be explained from which theoem

 Reciprocity theorem
 Compensation theorem
 Thevinin's theorem
 Norton's theorem

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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}[1-(R1 / R) *e - {(R - R1 )*t/L}
 i = {E / (R - R1)}[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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