A glass bead charged to $+3\mathrm{.}4$ nC exerts an $7\mathrm{.}0{10}^{-4}N$ repulsive electric force on a plastic bead $2\mathrm{.}5$ cm away.

Part A

What is the charge on the plastic bead?

$+1\mathrm{.}4nC$

$+4\mathrm{.}7nC$

$+14nC$

$+470nC$

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