A hollow non conducting spherical shell has outer radius r2 = 17cm and inner radius of r1= 6 cm. A charge of q = -25nC lies at the center of the shell. The shell carries a spherically symmetric charge density rho = Ar for R1
1. What is the radial electric field at the point r = 0.5(R1+R2)? Give answers in units of kN/C.
2. What is the radial electric field at the point r = 2R2? Give your answers in units of kN/C.