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An infinitely long solid cylinder of rad...

An infinitely long solid cylinder of radius R has a uniform vlume charge density `rho`. It has a spherical cavity of radius `R//2` with its center on the axis of the culinder, as shown in the figure. The magnitude of the electric field at the point P, which is at a distance 2R from the axis of the cylinder, is given by the expression ` 23rhoR//16kepsilon_0`. The value of k is

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`16.00`
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