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A circular conducting loop is held fixed in a uniform magnetic field thatt varies in time according to B(t) = B

_{0}exp(-at) where t is in s, a is in s

^{-1}and B is the field strength in T at t=0. At t=0, the emf induced in the loop is 0.0758 V. At t= 1.76 s, the emf is 0.0192 V. Find a. Answer in units of s

^{-1}

## Homework Equations

emf= [tex]\frac{d\Phi}{dt}[/tex]

## The Attempt at a Solution

I'm quite lost on this problem! I tried plugging in 0.0192 = B(t)/ 1.76 and solve for a, but obviously that did not produce the correct answer. Any help would be appreciated!