Question: The spherical surfaces r = 1 , 2 and 3 carry surface charge densities of 2 0 , - 9 and 2 nC / m

The spherical surfaces r =1,2 and 3 carry surface charge densities of 20,-9 and 2 nC/m2, respectively. (i) How much electric flux leaves the surface r =5? Find D at P(1,-1,2)

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