Answer
$V=1.8KV$
Work Step by Step
We will use the following formula to find $V$:
$V=K\frac{q}{r}$
We plug in the known values to obtain:
$V=9\times10^9\frac{3\times 10^{-8}}{0.15}$
$V=1.8\times 10^3$
$V=1.8KV$
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