Question 1 The figure shows a hollow metal sphere with inner radius 3.50 cm and outer radius 14.0 cm and a point charge at the center. The inner surface of the hollow sphere has a total charge of 7.10 nC and the outer surface has a total charge of -20.9 nC. Calculate the value of the charge at the center of the metal sphere. Answer: Question 2 The figure provided shows a section of a very long rod of radius a = 1.34 mm and linear charge density 2.84 nC/m. The rod is inside a coaxial cylindrical shell of radius b = 12.4 mm and linear charge density -6.47 nC/m. What is the magnitude of the electric field at a radial distance of 18.0 mm