# Calculate the potential at a point P due to a charge of $4 × 10^{–7}\;C$ located $9\; cm$ away.
$\begin{array}{1 1} 4 \times 10^4 \;V \\ 3 \times 10^4 \;V \\ 6 \times 10^4 \;V \\ 10 \times 10^4 \;V \end{array}$