need answer for 2nd part only( potential at r=0), will rate 5 star immediately f

Question

need answer for 2nd part only( potential at r=0), will rate 5 star immediately for correct answer

10.0 points Consider a uniformly charged insulating sphere with radius R and total charge Q inside the sphere. If Q = 7.9 x 10 6 C, what is the magnitude of the electric field at r = R/2? K =1/4 7T en If the sphere has a radius of 4.6 m, find the potential at r = 0. The Coulomb constant is 8.98764 x 109 N- m2/C2 . Follow the convention that the electric potential at r = oo is zero.Answer in units of V

Explanation / Answer

taking elemental hollow spheres of widht dr of radius r.

charge density of sphere, p=3Q/4piR^3

charge on a hollow sphere,dq = p4pir^2dr

potential due to a hollow sphere on centre, dv=dq/Kr

so, dv=p4pirdr/K

V=4ppiR^2/2K = 3Q/2KR

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