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The force between two charges, ?1 and ?2, that are separated by 20 ?? is 10...

The force between two charges, ?1 and ?2, that are separated by 20 ?? is 10 ?. If a third charge is placed at the midpoint between the first two charges and it does not move, what are the magnitudes of ?1 and ?2? Do ?1 and ?2 have the same or opposite signs and why?

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