Let $P\left(r\right)=\frac{Q}{\pi R^4}r$ be the charge desntiy distribution for a solid sphere of radius R and total charge Q. for a point 'p' inside the sphere at distance \displaystyle{r}_{}

Let $P\left(r\right)=\frac{Q}{\pi R^{|}|)r}$ be the charge desntiy distribution for a solid sphere of radius R and total charge Q. for a point 'p' inside the sphere at distance $r_1$ from the centre of the sphere, the magnitude of electric field is