EMF in an AC generator

1. Oct 23, 2009

umar.ali

1. The problem statement, all variables and given/known data
Need to draw a graph of the emf generated by a simple single-phase generator which has a coil of 200 turns. The coil is 14cm long and 9cm wide. The magnetic feild in the generator is 0.15T. The generator coil is turned at a rate of 3000 revolutions per minute. Can someone also calculate the maximum EMF for this generator. And also if someone could clarify the difference between maximum emf and average emf?

2. Relevant equations
EMF=NBA/t

3. The attempt at a solution
My graph resembles a sine graph but the starting point at t=0 is at EMF=0. In the answer it should be that it starts at maximum EMF (ie at t=0)

2. Oct 23, 2009

rock.freak667

While this is correct, this assumes the magnetic field was perpendicular. At an angle θ , the B should change to Bcosθ

and E=-dΦ/dt