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An infinitely long solid cylinder of rad...

An infinitely long solid cylinder of radius R with uniform volume charge density `rho` has a spherical cavity of radius `(R)/(2)` with its centre on the axis of the cylinder as shown in the figure. The magnitude of the electric field at a point P which is at a distance 2R from the axis of the cylinder is given by `(23rhoR)/(6Kepsilon_(0))`. What is the value of K ?

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