Here is the problem which I am struggling on, please help me!
Problem: An LR circuit contains an ideal 60-V battery, a 51-H inductor having no resistance, a 21- resistor, and a switch S, all in series. Initially, the switch is open and has been open for a very long time. At time t = 0 s, the switch is suddenly closed. When the voltage across the resistor is equal to the voltage across the inductor, what is the current in the circuit?
Show all work, use additional paper if necessary.