An insulated sphere of radius `R` has a uniform volume charge density `lambda`. The electric field at a point `A`, which is at distance `r` from its center is given by `(R gt r)`

Options

A. `(rho R)/(3 epsilon_(0))`
B. `(rho r)/(epsilon_(0))`
C. `(rho r)/(3 epsilon_(0))`
D. `(3 rho r)/(epsilon_(0))`

Answer

3

Explanation

`E = (1)/(4 pi in_(0)) (Qr)/(R^(3)) = (1)/( 4 pi in_(0)) . (rho . (4)/(3) pi R^(3) r)/(R^(3)) = (rho r)/(3 in_(0))`