WEBVTT
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Well let's plug into this equation.
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When we carry out this multiplication, we get a result of -1.35 x10¹⁰ J.
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Now notice that this is a negative number and in fact, if r were smaller,
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so these were closer together, it would have been a more negative number.
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It would have been a lower potential energy.
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Now in genuine physics, objects like to be in a low energy state.
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Balls like to roll downhill and positive charges like to be with negative charges.
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And we can see in this equation that if one charge is positive and the other negative,
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well this energy will be negative, and this r want to be as small as it possibly can.