A spherical conductor of radius R = 1.5 cm carries the charge of 45, (a) What is

A spherical conductor of radius R = 1.5 cm carries the charge of 45μ,
(a) What is the charge density (ρ) of the sphere?
(b) Calculate the electric field at a point r = 0.5 cm from the center of the sphere.
(c) What is the electric field on the surface of the sphere?

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