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**1. Homework Statement**

The magnetic field perpendicular to a circular loop of wire 23 cm in diameter is changed from +0.52 T to -0.45 T in 175 ms, where + means the field points away from an observer and - toward the observer.

**2. Homework Equations**

(pardon me with the equations, I am LaTeX challenged.)

emf = N x (delta flux)/(delta time)

emf = Blv

**3. The Attempt at a Solution**

emf = (1) (.97)/(.175)

emf = 5.54 V

I have seen this equation with a negative infront...does this need to be put in the answer? This is for a WebAssign. I apologize for the rushed manner in which I posted this, but I have a ton of other work to do. Any help on this is greatly appreciated.