A spherical capacitor contains a charge of 3.20 nC when connected to a potential difference of 220 V. Its plates are separated by vacuum and the inner radius of the outer shell is 5.60 cm.
(a) Calculate the capacitance.
pF
(b) Calculate the radius of the inner sphere.
cm
(c) Calculate the electric field (magnitude) just outside the surface of the inner sphere.
N/C