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A solid sphere of radius R has a charge Q distributed in its
volume with a charge density p= kr, where k and a are
constants and is the distance from its centre. If the electric
ľ
R. 1
is times that at r= R, find the value of a
28
field at r =

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Charge is distributed throughout a spherical volume of radius R with a density p = ar6, where a is a constant and ris the distance from the center of the sphere. Determine the electric field due to the charge at a point a distance r from the center that is inside the sphere, and at a point a distance r from the center that is outside the sphere. (Enter the radial component of the electric field. Use the following as necessary: R, a, r, and ɛn.) inside the sphere E = outside the sphere E =