An infinitely long solid cylinder of radius R with uniform volume charge density ρ has a spherical cavity of radius 
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 
. What is the value of K?
Text Solution
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The electric field at the point P due to the entire cylinder is
The electric field at the P due to the spherical cavity is
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