The potential of a sphere with charge q and radius R is given by:
V = $\frac{k \cdot q}{R}$
where k is the electrostatic constant, approximately $8.99 \times 10^9 \ Nm^2/C^2$. Plugging in the values, we get:
V = $\frac{8.99 \times 10^9 \ Nm^2/C^2 \cdot 1.25
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