How to plot it graph in Mathematica

[roshan2004]

The potential inside of a uniformly charged sphere of radius R is given by \frac{Q}{4\pi \epsilon _{0}}\frac{1}{2R}(3-\frac{r^2}{R^2}).
Please help me on how to plot this equation in Mathematica

 

[JHamm]

I think it goes something like
Plot[\frac{Q}{4\pi \epsilon _0} \frac{1}{2R}(3-\frac{r^2}{R^2}, \{ r, 0, R \} ]
If you have any problems check the documentation http://reference.wolfram.com/mathematica/ref/Plot.html

:)

 

[roshan2004]

Thanks for the help, but it shows error.

 

[nasu]

You cannot plot it as a general formula. You need to assign values to the parameters (Q, epsilon_o, R) so you will have a function of one variable only (r).

 

[JHamm]

Oops my bad, sorry :)