An inductor and a resistor are connected with a double pole switch to a battery

Question

An inductor and a resistor are connected
with a double pole switch to a battery as
shown in the figure.
The switch has been in position b for a long
period of time.

Part 1 - If the switch is thrown from position

Answer in units of ms.

=5.432ms

Part 2 - What is the maximum current in the inductor a long time after the switch is in position a?

Answer in units of A.

=1.213A

Part 3 - The switch has brushes within it so that the switch can be thrown from a to b without internal sparking. Now the switch is smoothly thrown from a to b, shorting the inductor and resistor. How much time elapses before the current falls to 74 mA?

Answer in units of ms.

= ?

I think you use I = (Inot)(e)^-tR/L

but it doesnt come out right

Explanation / Answer

A

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