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## Homework Statement

Your circuit has a resistance of 175Ω and an ideal battery with an emf of 6.3V. What value of inductor should you add to the circuit to ensure the current increase in the first 58μs is less than 4.9mA?

## Homework Equations

I think

E=L(di/dt)

## The Attempt at a Solution

E=L(di/dt)

6.3=L(4.9*10^-3/58*10^-6)

L = 0.07457H

But the answer is 0.069H

Thanks.