A 8N force acts on a rectangular conductor 20 cm long placed perpendicular

to a magnetic field. Determine the magnetic field induction if the current in the conductor is 40 A.

Force on conductor F = 8N

Length of conductor l = 20 cm = 20/100 m

Current in the conductor I = 40 A

Magnetic field induction B = ?

F = BIl

B=F/Il

B = 8 X 100/40 X 20 = 1 tesla