R3 R2 R1 Figure 1: A simplified view of a Z-pinch. The blue area is filled with a uniform current, I = 5 x 10 A directed into the page, with a radius of R1 = 1.5mm. The red area has a uniform current of I = 5 x 10*A, but is directed out of the page, and has an inner radius of R2 = 2cm and an outer radius of R3 = 2.5cm. 1. In a Z-pinch, current flows into the pinch in the center, then must flow out through what is known as a current return can. This can be seen in figure 1. If the pinch has a current of I = 5 x 10 A, then what is the magnetic field as a function of r? Your answer will most likely be a step-function with four different areas