Question: Let J = 400 sin /(r 2 + 4) a r A/m 2 . (a) Find the total current flowing through that portion of the

Let J = 400 sin θ/(r2 + 4) ar A/m2.

(a) Find the total current flowing through that portion of the spherical surface r = 0.8, bounded by 0.1π < θ < 0.3π, 0 < ϕ < 2π.

(b) Find the average value of J over the defined area.

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