A Positive charge Q is placed on a conducting spherical shell with inner radius `R_(1)` and outer radius ` R_2` . A particle with charge q is placed at the center of the spherical cavity . The magnitude of the electric field at a point in the cavity , a distance r from center is

Options

A. zero
B. `Q/4 (pi epsilon_@R^2)`
C. `q/(4 pi epsilon_@r^2)`
D. `(q+Q)/(4 pi epsilon_@r^2)`

Answer

C

Explanation

Answer(3) E = `1/(4 pi in_@ q/r^2`