The nuclear charge (`Ze`) is non uniformlly distribute with in a nucleus of radius r. The charge densilty `rho(r)` (charge per unit volume) is dependent only on the radial distance r form the centre of the nucleus s shown in figure. The electric field is only along the radial direction.
The electric field within the nucleus is generaly observed to be linearly dependent on r. This implies
A. a=0
B. `a=(R)/(2)`
C. a=R
D. `a=(2R)/(3)`
