b The figure shows a hollow plastic sphere with inner radius 2.20 cm and outer radius 14.4 cm and a point charge at the center. The hollow sphere has a uniform charge of -21.6 nC. The electric field a distance 19.0 cm from the center of the sphere is 9500 "N/C" pointing outwards from the center. Calculate the value of the charge at the center of the sphere. Answer:+ + + + + + A hollow sphere has a uniform volume charge density of 4.57 nC/m . The inner radius is a = 18.9 cm and the outer radius is b = 94.5 cm. What is the magnitude of the electric field at 9.45 cm from the center of the sphere? What is the magnitude of the electric field at 265 cm from the center of the sphere?Q. The gure provided shows a section of a very long rod of radius a = 1.78 mm and linear charge density 3.53 nC/m. The rod is inside a coaxial cylindrical shell of radius [3 = 8.80 mm and linear charge density -6.99 nC/m. What is the magnitude and direction of the electric field at a radial distance of 5.13 mm? Direction: 0 Inward O Outward What is the magnitude and direction of the electric field at a radial distance of 17.4 mm? Direction: 0 Inward O Outward Two charges are set on the xaxis 9.80 cm away from each other. The charges are -5.60 nC and 22.6 nC. Calculate the electric potential at the point on the xaxis where the electric eld due to these two charges is zero