Assume two spherical shells of radius 5.00 cm and 9.00 cm have a charge of -1.8 microcoulombs on the smaller shell and +1.8 microcoulombs on the larger shell.

a. Derive an equation for the potential difference between the two shells

b. Determine the actual potential difference between the two shells.

c. From 2a, derive an equation for the capacitance of two concentric metal spherical shellsd. Determine the actual capacitance between the two spherical shells.