A generator uses a coil that has 120 turns and a 0.65 T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire from which the coil is made.
m

here is a formula to find the magnetic field of a similiar problem. Could this be manipulated somehow to find the length instead?
http://img255.imageshack.us/img255/7181/94266915uq6.png

please help with this.