Solenoids produce magnetic fields that are relatively intense
for the amount of current they carry. To make a direct
comparison, consider a solenoid with 55 turns per centimeter, a
radius of 1.25 cm, and a current of 0.170 A. (a) Find the
magnetic field at the center of the solenoid. (b) What current
must a long, straight wire carry to have the same magnetic field
as that found in part (a)? Let the distance from the wire be the
same as the radius of the solenoid, 1.25 cm. Not sure how to do
this one, i maybe use the turns to find force, then use
F=ILBsin() ??? any help is appreciated