When a battery is connected across a series combination of self inductance L and resistance R , the variation in the current i with time t is best represented by

When a battery is connected across series connection of two unequal resistances.

When a battery is connected across a parallel combination of two unequal resistances.

A voltage V_0sinomegat is applied across a series combination of resistance R and inductor L. The peak value of the current in the circuit is

A sinusoidal voltage Vsin(at) is applied across a series combination of resistance R and inductor L. The amplitude of the current in the circuit is

A sinusoidal voltage Vsin(at) is applied across a series combination of resistance R and inductor L. The amplitude of the current in the circuit is

When galvanometer of unknown resistance connected across a series combination of two identical batteries each of 1.5 V, the current through the resistor is 1A. When it is connected across parallel combination of the same batteries, the current through it is 0.6 A. The internal resistance of each battery is