Could i get some help with this ? Thank you.

Question 1 ++++++++ ++++++++ A hollow sphere has a uniform volume charge density of 3.91 nC/m3. The inner radius is 6:163 cm and the outer radius is b = 33.6 cm. What is the magnitude of the electric eld at 23.5 cm from the center of the sphere? : Question 2 Conducting Cylinder 5 cm 10 cm 15 cm 8 cm 17 cm In the figure provided, a 4.80 m long solid metal cylinder is at the center of a hollow metal cylinder. The electric fields shown in the figure both have a magnitude of 1.70x104 N/C. What is the total charge on the exterior of the inner cylinder?8. (Knight Problem 25.39) A +3.0 nC charge is at x = 0 cm and a -1.0 nC charge is at r = 4 cm. At what point or points on the r-axis is the electric potential zero? [Answer: 3.0 cm, 6.0 cm.] 9. (Knight Problem 25.51) What is the escape speed of an elec- tron launched from the surface of a 1.0-cm-diameter glass sphere that has been charged to 10 nC? [Answer: 8.0 x 10' m/s.] 10. (Knight Problem 25.57) A proton is fired from far away to- ward the nucleus of a mercury atom. Mercury is element number 80, and the diameter of the nucleus is 14.0 fm. If the proton is fired at a speed of 4.0 x 10' m/s, what is its closest approach to the surface of the nucleus? Assume the nucleus remains at rest. [Answer: 6.8 fm.] 11. (Knight Problem 25.71) Fig- + ure P25.71 shows a thin rod with charge Q that has been bent into a semicircle of ra- R dius R. Find an expres- sion for the electric poten- Center tial at the center. [Answer: Q/4TEOR.] Charge @ +