In a demonstration of the above equation, the length of wire in a magnetic field is 0.05 m.  When a current of 2.5 A flows, a force of 0.01 N is shown.  What is the magnetic field strength?                      

Use F = BIL.  0.01 N = B ´ 2.5 A ´ 0.05 m (P)

B = 0.08 T (P)