# Homework Help: Find expression for electric field given B(t)

1. Nov 25, 2016

### mkematt96

1. The problem statement, all variables and given/known data
See picture above

2. Relevant equations
Int (E dot dl) = Int (B dot dA)

3. The attempt at a solution

Where did I go wrong? Is there a sign error possibly or am I off conceptually?

2. Nov 25, 2016

### Charles Link

The only thing I see that is incorrect is in your relevant equations (2), it should say $-dB/dt$ instead of $B$. Their $dl$ in the figure is in the opposite direction of what it should be, but I don't think that is your mistake. The line integrals in these Stoke's formulas always go counterclockwise with +z out of the paper. Perhaps the instructor wanted you to spot that anomaly, etc....

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