Chapter 29, Problem 77EAP

A wire along the x-axis carries current I in the negative x direction through the magnetic field

<m:math display='block'> = 0 B 0 x l k ^     0 ≤ x ≤ l

a. Draw a graph of B versus x over the interval $-\frac{3}{2}l<x\frac{3}{2}l$. b. Find an expression for the net force , on the wire.

c. Find an expression for the net torque on the wire about the point $x=0$ .