Solve the all parts of given question:
Question: A spherical capacitor is formed from two concentric, spherical, conducting shells separated by vacuum. The inner sphere has radius 15.0cm and the capacitance is 115pF.
Part A: What is the radius of the outer sphere?
Part B: If the potential difference between the two spheres is 220 V, what is the magnitude of charge on each sphere?
Please provide a detailed response this is a practice test question so I have the answer just can't figure out how to get to it.