A nonuniform magnetic field exerts a net force on a current loop of radius R. FIGURE P29.78 shows a magnetic field that is diverging from the end of a bar magnet. The magnetic field at the position of the current loop makes an angle θ with respect to the vertical.

a. Find an expression for the net magnetic force on the current.
b. Calculate the force if R = 2.0 cm, I = 0.50 A, B = 200 mT, and θ = 20°.

Transcribed Image Text:

net 2R B. FIGURE P29.78 B