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Image text transcribed for accessibility: The current density in a certain region is approximated by J = (0.1 /r) exp (-106t) a , A/m2 in spherical coordinates, (a) At t = 1 mu s. how much current is crossing the surface r = 5? (b) Repeat for r = 6. (c) Use the continuity equation to find rho ,.(r, t) assuming that rhov rightarrow 0 as t rightarrow . (d) Find an expression for the velocity of the charge density.

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