Question

Me Ajunde por favor!!
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Answer 1

$E_{p} = \frac{kQq}{d} = \frac{kQ}{d}.q = V.q \\ V = \frac{E_p}{q} = \frac{6 \times 10^{-3}}{9 \times 10^{-6}} \\ V = 666,67 \ V$