Solve the each part of given question:
Question: An air-filled spherical capacitor is constructed with an inner-shell radius of 6.80 cm and an outer-shell radius of 15.4 cm.
Part A: Calculate the capacitance of the device.
____________pF
Part B: What potential difference between the spheres results in a 4.00-µC charge on the capacitor?
____________ kV
Please explain how you came to your conclusion.