please answer both accurately

10. [0/1 Points] DETAILS MY NOTES SERPSE10 24.5.0P.024. PREVIOUS ANSWERS ASK YOUR TEACHER PRACTICE ANOTHER A uniformly charged insulating rod of length 13.0 cm is bent into the shape of a semicircle as shown in the figure below. The rod has a total charge of -9.00 pC. Find the electric potential at O, the center of the semicircle. (19686 | X All the charge is equidistant from the center. Would the potential change if we gathered all of the charge into a single point at this same distance? MV (| 0 Need Help? |[_Resan_J| [ wetenn || [ Submit Answer 11. [0/2 Points] DETAILS MY NOTES SERPSE10 24.6.0P.026.MI. PREVIOUS ANSWERS ASK YOUR TEACHER PRACTICE ANOTHER Lightning can be studied with a Van de Graaff generator, which consists of a spherical dome on which charge is continuously deposited by a moving belt. Charge can be added until the electric field at the surface of the dome becomes equal to the dielectric strength of air. Any more charge leaks off in sparks as shown in the figure below. Assume the dome has a diameter of 16.0 cm and is surrounded by dry air with a "breakdown" electric field of 3.00 x 108 v/m. David Evison/Shutterstock.com (@) What is the maximum potential of the dome? ,--48 % Your response differs from the correct answer by more than 10%. Double check your calculations. kV (b) What is the maximum charge on the dome? ; ) uc L