Question

A current 5A passes through a straight wire in a uniform magnitude field of a flux density. 2.0 T. Calculate the force per unit length exerted on the wire when it is inclined at 30° to the field.

Answer 1

Write an equation for the force:

$$F=IBL\text{ sin}\theta,$$

force per unit length is

$$F/l=IB\text{ sin}\theta=5\text{ N/m}.$$