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## Homework Statement

an electromagnet is operated at 50A. assuming an inductance of 100H for the magnet's coil, what voltage will be developed when the switch is opened? when it is closed? assume that the switch requires 1 millisecond to operate.

## Homework Equations

I(t) = Vb/(R(1-e^(-tR/L)))

## The Attempt at a Solution

with the given formula above I am not quit sure how to proceed if I am not given resistance. any insight on how I should proceed with this problem would be great!