I was reading this ebook when I found Coulomb's law:(adsbygoogle = window.adsbygoogle || []).push({});

http://www.brokendream.net/xh4/elec.jpg

What I'm unsure of is how the gradient function applied to 1/|x-x'| is the same thing as |x-x'|/|x-x'|^3...

I know what the gradient function is but I'm totally lost as to how the formula was transformed that way..

Can anyone care to explain?

Thanks alot.

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# Gradient function?

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