I need help with the second question (Part B). I have used nearly all of my trie

Question

I need help with the second question (Part B). I have used nearly all of my tries and still cant get the right answer. I will rate 5 stars for the first correct answer!

Part A Find an expression for the capacitance of a spherical capacitor, consisting of concentric spherical shells of radii R1 (inner shell) and R2 (outer shell). Express your answer in terms of the variables R1, R2 and appropriate constants. Part B A spherical capacitor with a 3.0mm gap between the shells has a capacitance of 250 pF. What are the diameters of the two spheres? Express your answers using three significant figures separated by a comma.

Explanation / Answer

C = 4 ? ?

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