일반물리학 2 — Maxwell's Equations; Magnetism of Matter: Problem 5

5 Uniform displacement-current density. Figure 32-19 shows a circular region of radius \( R = 4.00 \text{ cm} \) in which a displacement current is directed out of the page. The displacement current has a uniform density of magnitude \( J_d = 6.00 \text{ A/m}^2 \). What is the magnitude of the magnetic field due to the displacement current at radial distances (a) 2.00 cm and (b) 5.00 cm?