Chapter 20, Problem 15P

* (a) Determine the magnetic force (magnitude and direction) that a 0.15-T magnetic field exerts on segments a, b, and c of the wire shown in Figure P20.15. Segments a and c are 2.0 cm long, and segment b is 10.0 cm long. A 3.0-A current flows through the wire. (b) Determine the net torque caused by forces ${\stackrel{\to }{F}}_{\stackrel{\to }{B}\text{ on a}}\text{ and }{\stackrel{\to }{F}}_{\stackrel{\to }{B}\text{ on c}}$ and the torque caused by force ${\stackrel{\to }{F}}_{\stackrel{\to }{B}\text{ on b}}$.