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PROBLEM 4: A capacitor consists of two hollow shells filled with air between them; the outer shell has a radius b and the inner shell has a radius a. (a) Suppose that the electric field magnitude at the outer surface of the inner shell has a value of E. How much energy is stored in the capacitor? Express your answer in terms of the following variables: b, a, and/or E. (b) Calculate the numerical answer to part (a) using the following values: b 23 cm, a 12 cm, and E 3.0 x 106 V/m.

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