Non-uniform displacement-current density figure 32-30 shows a circular region of radius R = 3.00 cm in which

Question:

Non-uniform displacement-current density figure 32-30 shows a circular region of radius R = 3.00 cm in which a displacement current is directed out of the page. The magnitude of the density of this displacement current is Jd = (4.00 A/m2) (1 - r/R), where r is the radial distance (r ‰¤ R).What is the magnitude of the magnetic field due to the displacement current at?
(a) r = 2.00 cm
(b) r = 5.00 cm