Answer
$V=37200$ V
Work Step by Step
For Gaussian surface, the electric flux is given as:
$\phi=\frac{q}{\epsilon_{\circ}}$
This simplifies to
$q={\phi}{\epsilon_{\circ}}$
We plug in the known values in the formula to obtain:
$q=5.60\times 10^4\times 8.85\times 10^{-12}$
$q=4.956\times 10^{-7}C$
Now we can find electric potential through the formula:
$V=K\frac{q}{r}$
We plug in the known values in this formula to obtain:
$V=9\times 10^9\times\frac{4.956\times 10^{-7}}{0.12}$
$V=37200V$
