E&M Physics. Potential Difference

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zwebb
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Hello, I am in electricity and magnetism. I have a question about a homework problem.

A 1000-turn loop (radius = 0.034 m) of wire is connected to a (20 ohm) resistor as shown in the figure. A magnetic field is directed perpendicular to the plane of the loop. The field points into the paper and has a magnitude that varies in time as B=gt, where g=0.25 T/s. Neglect the resistance of the wire.

What is the magnitude of the potential difference between points a and b?

I fully understand that you guys cannot give me the answer. I would just like an explanation of how to find this, or an equation. I have already looked through my book to no avail. THANKS!
 
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What figure? Where is a and b?