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

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Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

 60 W lamp filament has longer length.
 60 W lamp filament has shorter length.
 60 W and 100 W lamp filament have equal length.
 100 W lamp filament has longer length.

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