Step $1$: Adding your data in Excel

Here is an example of how you may plot your data in Excel. If you prefer any other graphical software, it is totally up to you, just make sure that your graph contains all elements as is shown on the examples below and looks good.

Example: let's say, the data in your Table $1$ looks like this

Distance : $0$;$1$;$2$;$3$;$4$;$5$;$6$;$7$;$8$;$9$;$10$

Electric Potential : $0$;$3$;$6$;$9$;$12$;$15$;$18$;$21$;$24$;$27$;$30$

Please note, your data values will look differently from these example values.

Enter these data in Excel, in two columns, as shown on the picture.

Please note: Distance $r$ data need to be in the first column, while Electric Potential $V$ data need to be in the second.

Step $2$: Plotting your data in Excel

Select your data, and then go to Insert in the top menu. Go to Insert Chart, and select Scatter Chart.

Step $3$: Adding the chart elements

Click on the top right of your chart and ensure that you have all necessary chart elements $($Axes$,$ Axis Titles, Chart Title, Gridlines, and Trendline$)$ checked, as shown on the picture below. Then click on the Axis Titles, and put Voltage, $V$ on the vertical axis, and Distance, $m$ on the horizontal axis, as shown on the next pictures.

Now, again click on the top right of your chart and in the Chart Elements go to Trendline, and select More Options, as shown on the picture below.

Next, in the Format Trendline menu, in Trendline options, select Power. Also, click on Display Equation on chart.

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