There is spherical symmetric charge distribution around origin. The electrostatic potential (in Volts) at a distance ‘r’ from origin is given as $V=\frac{-K{r}^4}{4}$ where K is a positive constant. The slope of tangent drawn to volume charge density vs ‘r’ graph at $r=\frac{1}{2}mis\alpha K{\epsilon }_0$. Then find value of $\text{'}\alpha \text{'}$.