A $5\mathrm{.}0$ gg ball charged to $1\mathrm{.}5$ CC is tied to a $25-$cmcm$-$long string. It swings at $250$ rpmrpm in a horizontal circle around a stationary ball charged to $-2\mathrm{.}5$ CC$.$

Part A

What is the tension in the string?

Express your answer with the appropriate units.

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