Part A

How much equal charge should be placed on the Earth and the Moon so that the electrical repulsion balances the gravitational force of $1\mathrm{.}98{10}^{20}N?$ Treat the Earth and Moon as point charges a distance $3\mathrm{.}84{10}^{8}m$ apart.

Express your answer to three significant figures and include appropriate units.

$18\mathrm{.}01*{10}^5$

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