In TBR, it seems to says that electrostatic force is always positive, with the equation of Coloumb’s Law being -

F = k | Q1 * Q2 | / r^2

However, the book then presents a graph where two like charges would have an inverse relationship on the positive side of a y-axis going towards y= 0 with distance between the charges. However, if the charges are opposite, there is an inverse relationship plotted along the negative y-axis as a mirror image of first graph along the x-axis. How could we plot this if we are taking the magnitude of both charges? Would we need to include the signs of each charge?

Here is an image of a data of that graph: https://files.mtstatic.com/site_453...3QCcC6VVNy8_&Key-Pair-Id=APKAJ5Y6AV4GI7A555NA

F = k | Q1 * Q2 | / r^2

However, the book then presents a graph where two like charges would have an inverse relationship on the positive side of a y-axis going towards y= 0 with distance between the charges. However, if the charges are opposite, there is an inverse relationship plotted along the negative y-axis as a mirror image of first graph along the x-axis. How could we plot this if we are taking the magnitude of both charges? Would we need to include the signs of each charge?

Here is an image of a data of that graph: https://files.mtstatic.com/site_453...3QCcC6VVNy8_&Key-Pair-Id=APKAJ5Y6AV4GI7A555NA

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