RL Circuit Charging: The Effects of Closing the Switch on Inductor Charge

[influx]

What happens when the switch closes? Does the inductor continue to charge? If yes, how can this be so when the inductor is already fully charged (the question says the switch was open for a long time, so I assumed it has been fully charged)?

 

[rude man]

First, an inductor does not 'charge'. It sustains a current.

Before the switch closes the inductor sustains a certain constant current. When the switch closes the inductor current will start to sustain a larger current. Eventually it will sustain 4 times as much current as before the switch was closed.