1. A insulating solid sphere of radius 5 cm carries a uniform charge density given as ρ( r) = ρ0r2 where ρ0 = 5.0 x 102 C/m5 and r is the radial distance measured from the center of the sphere. This insulating sphere is placed at the center of a concentric hollow conducting sphere (inner radius = 15 cm and outer radius = 25 cm) that carries an excess charge. Q = - 8.0 x 10-8 C. By constructing an appropriate Gaussian surface. Apply Gauss s law to determine the magnitude and direction of the electric field at the radial point. r = 30 cm from the common center of spheres.
