Physics

Problem

A solid ball of radius

R

has a charge density

\rho

given by

\rho = \rho_0 \left( 1 - \frac{r}{R} \right)

for

0 \le r \le R

. The electric field outside the ball is: a.

\frac{\rho_0 R^3}{\epsilon_0 r^2}

\frac{4\rho_0 R^3}{3\epsilon_0 r^2}

\frac{3\rho_0 R^3}{4\epsilon_0 r^2}

\frac{\rho_0 R^3}{12\epsilon_0 r^2}