Answer
$V=2.4\times 10^5V$
Work Step by Step
We know that,
$V=K\frac{q}{r}$
We plug in the known values in the formula above to obtain:
$V=9\times 10^9\times \frac{4\times 10^{-6}}{0.15}$
$V=2.4\times 10^5V$
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