일반물리학 2 — Maxwell's Equations; Magnetism of Matter: Problem 6

6 Uniform displacement current. Figure 32-19 shows a circular region of radius $R = 3.00\text{ cm}$ in which a uniform displacement current $i_d = 0.300\text{ A}$ is out of the page. What is the magnitude of the magnetic field due to the displacement current at radial distances (a) $2.00\text{ cm}$ and (b) $5.00\text{ cm}$?