# Solenoid physics homework

## Homework Statement

A small 2.0-mm-diameter circular loop with R = 0.020 Ohms is at the center of a large 100-mm-diameter circular loop. Both loops lie in the same plane. The current in the outer loop changes from +1.0 A to -1.0 A in 0.10 s. What is the induced current in the inner loop?

## Homework Equations

$$\epsilon = \frac{\delta \Phi}{\delta t}$$

## The Attempt at a Solution

I'm not sure how to relate $$\frac{\delta I}{\delta t}$$ to Lenz's Law. Just a hint would be great.

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