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Illustration Large source charge and small test charge in Coulomb's law

<span>Large source charge and small test charge in Coulomb's law</span>
Large source charge and small test charge in Coulomb's law
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A large source charge \( \class{red}{Q} \) exerts an electric force \( F_{\text e} \) on a small test charge \( \class{blue}{q} \), which is at a distance \( r \) from the source charge.