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a) If the radius of the circular arc of the trajectory is 4.0 m, find the magnitude of the constant magnetic field.

b) The engineers who installed these magnets tested the magnetic field by inserting a single square coil of side .2 m. The plane of the coil was made parallel to the field lines. They measured the torque on this coil when it carried a current. They found th torque to be .15 N.m for the magnetic field you found in part (a). What was the current in the square coil?

For part A, I know I can use the equation:

B = uI/2(pi)r

Plug in what I know, I end up with :

B = 4(pi)x10^-7 (I) / 2(Pi)(4.0m)

or

2 (pi) x 10^-7 (I) / 4.0 m

However I am unsure what the current is and therefore, do not know what to plug in for I.