8. A solid nonconducting sphere carries a uniform charge density p = 1.5 uC/m). What is the magnitude of the electric field inside the sphere at a distance of 7.0 cm from its center? a) 2.26 kN/C b) 4.12 kN/C c) 3.95 kN/C d) 3.39 kN/C e) 2.82 kN/C