Question: A cylindrical capacitor consists of a solid inner conducting core with radius 0.250 cm, surrounded by an outer hollow conducting tube. The two conductors are

A cylindrical capacitor consists of a solid inner conducting core with radius 0.250 cm, surrounded by an outer hollow conducting tube. The two conductors are separated by air, and the length of the cylinder is 12.0 cm. The capacitance is 36.7 pF.
(a) Calculate the inner radius of the hollow tube.
(b) When the capacitor is charged to 125 V, what is the charge per unit length).on the capacitor?

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