After the switches shown in the figure were closed for a long time, they were opened at the same time at t = 0. a) How many seconds after the switch is turned on, 30% of the energy stored on the 20 H...

After the switches shown in the figure were closed for a long time, they were opened at the same time at t = 0.

a) How many seconds after the switch is turned on, 30% of the energy stored on the 20 H inductor is consumed on the 40 kΩ resistor.

b) What percentage of the energy stored on the inductor has been dissipated at the moment you find in a)?