Given the circuit shown in the figure above assume that the

Given the circuit shown in the figure above, assume that the switch has been open for a very long time Immediately after the switch is closed, A The current through R_1 is zero. B The voltage across R_1 is equal to that of R_2, which is non-zero. C The magnitude of the voltage induced across the inductor is equal to the emf of the battery. D The current through R_2 is non-zero. E None of the above.

Solution

Just after closing the switch, current will pass through R1. The voltage dropped accross R1 will be the driving force for the inductor circuit. Inductor will start charging. As from inductor charging characteristics we know that, current increases from zero and saturates to a finite value after some time, so just after closing the switch, current through R2 will be zero.