23P1Q20

20 B

$\displaystyle \begin{aligned} (V&=k\frac{Q}{r}) \\ \frac{{{V}_{P}}}{{{V}_{R}}}&=\frac{1}{SP}\div \frac{1}{SR} \\ \frac{{{V}_{P}}}{636}&=\frac{2\sqrt{2}}{3} \\ {{V}_{P}}&=599.6\text{ V} \end{aligned}$

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