I Consider the annulus S in the plane z = 8.3m, defined by a < + < b°, a = 3.3 m, b= 4.4 m. The region surrounding S is filled with a conducting medium, where the current density is given as follows in spherical coordinates: 4 J= r sin(0) ae A/m? Find the net upward current through S. ANSWER: I = 4pi(4.4^2-3.3^2)

I Consider the annulus S in the plane z = 8.3m, defined by a < + < b°, a = 3.3 m, b= 4.4 m. The region surrounding S is filled with a conducting medium, where the current density is given as follows in spherical coordinates: 4 J= r sin(0) ae A/m? Find the net upward current through S. ANSWER: I = 4pi(4.4^2-3.3^2)