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Capacitance of a Random Conductor

An infinitely...

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An infinitely long solid cylinder of radius R has a uniform volume charge densityρ. It has a spherical cavity of Radius R/2 with its centre on axis of cylinder. The magnitude of electric field at point P, which is at dis†an ce 2R from axis of cylinder, is given by 23ρ R/16kε. the value of k is

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