A positive point charge q is placed at a distance 2 R from the surface of a metallic shell of radius R. the electric field at centre of shell due to induced charge has magnitude

Options

A. zero
B. `(1)/(4 pi epsilon_(0)) - (q)/(9 R^(2))`
C. `(1)/(4 pi epsilon_(0))(q)/(4R^(2))`
D. `(1)/(4 pi epsilon_(0)) (q)/(R^(2))`

Answer

B