Answer
$V=3.6\times10^5V$
Work Step by Step
We know that
$V=K\frac{q}{r}$
We plug in the known values to obtain:
$V=9\times10^9\times\frac{4\times10^{-6}}{0.10}$
$V=360000V$
$V=3.6\times10^5V$
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