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An air-filled spherical capacitor has inner radius, R₁ = 7.03 cm, and outer radius, R₂ = 19.5 cm.
(a) What is the capacitance of the spherical capacitor?
pF
(b) What is the charge on the capacitor when the potential difference between the spheres is 275 kV?
Q =
HC
(c) Suppose you needed to design an air-filled cylindrical capacitor that had the same inner radius,
outer radius, and capacitance as the spherical one. How long would you need to make it?
l =
cm

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