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Suppose a conducting sphere, radius r2, has a spherical cavity of radius r1 centered at the...

Suppose a conducting sphere, radius r2, has a spherical cavity of radius r1 centered at the sphere's center. At the center of the sphere is a point charge -4Q. Assuming the conducting sphere has a net charge +Q determine the electric field,magnitude and direction, in the following situations:
a) From r = 0 to r = r1.
b) From r = r1 to r = r2.
c) Outside of r = r2
d) find the surface charge density (charge per surface area) conductor, respectively.
the inside and outside surfaces of the on
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