Question: Two small pith balls, initially separated by a large distance, are each given a positive charge of (5.0 mathrm{nC}). By how much does the electric

Two small pith balls, initially separated by a large distance, are each given a positive charge of $5.0 \mathrm{nC}$. By how much does the electric potential energy of the two-ball system change if the balls are brought together to a separation distance of $2.0 \mathrm{~mm}$ ?

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