A point charge + q is placed at the centres of a conducting spherical shell of radius R . The shell is now given a charge + Q and a charge `+q_(0)` is placed at a distance ` r ( gt R)` from q .

Options

A. `1/(4piepsilon_(0)).(Qq_(0))/(r^(2))`
B. `1/(4piepsilon _(0)).(Qq_(0))/(r^(2))`
C. `1/(4piepsilon_(0)).((Q+q)q_(0))/(r^(2)) `
D. Zero

Answer

C

Explanation

`F = q_(0)E = (q_(0)(Q+q))/(4piin_(0)r^(2))`