A hollow, conducting sphere with an outer radius of 0.258m and an inner radius of 0.210m has a uniform surface charge density of +6.68×10?6C/m^2 . A charge of -0.830mC is now introduced into the cavity inside the sphere. the new charge= 5.69×10^?6c/m^2
A) Calculate the strength of the electric field just outside the sphere.
B) What is the electric flux through a spherical surface just inside the inner surface of the sphere?