Question

A wire 453 m long is in a 0.2 T magnetic field.
A 2.56 N force acts on the wire.
What current is in the wire?
Answer in units of mA

Answer 1

F = I •L•B• sinα
If this wire is at right angles to Magnetic field, sinα = 1, then
I=F/L•B=0.2/453•2.56 =1.76•10^-4 (A)= 0.176 mA.