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An infinitely long insulating pipe with an inner radius of 5cm and an outer radius of...

An infinitely long insulating pipe with an inner radius of 5cm and an outer radius of 7cm is uniformly charged. The electric field at a point in the center of the wall of the pipe is 1N/C inward. A second metal pipe encloses the first, with a radius of 9cm; the metal pipe is connected to an electric potential of +0.15V. What is the electric potential in the center of the wall of the insulating pipe?

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