Example
What is the field strength at the center of a loop that has 0.2 Amps running through 3400 turns, where the radius of the loop is 6 cm?
Bat center of loop = mo N I / 2R
B = (4p x 10-7 T*m/A) * 3400 * 0.2A / (2*.06m)
(As you move away from this center, the field will decrease.)