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(a) Calculate the flux through the triangle formed by the rails and bar at t = 2.50 s

(b) Calculate the magnitude of the emf around the triangle at that time.

(c) If we write the emf as E = at[tex]^{}n[/tex], where a and n are constants, what is the value of n?

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Alright, I can figure this out, only I don't know how to find the rate of change of the length of the two non-moving bars. With that, I could find the area at t = 2.50 s, and the change of the magnetic flux, and I could muddle through the last one ;)