Figure 10.39
10.4 Motional emf. An infinitely long, straight wire of radius r1 [m] carries a uniform current density J [A/m2]. The
direction of the current is as shown in Figure 10.40. Another infinite, thin wire parallel to the first wire moves to the
right at a velocity v0 [m/s]. Calculate the induced voltage (emf) per unit length in the moving wire, when the moving
wire is at a distance r [m] from the thick wire. The wires are shown in cross-section.