In a uniform electric field, the potential is $10$ $V $ at the origin of coordinates, and $8$ $V$ at each of the points $(1, 0, 0), (0, 1, 0) $ and $(0, 0, 1)$. The potential at the point $(1, 1, 1)$ will be....$V$
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In a uniform electric field, equal displacements cause equal changes in potential. Each of displacements $OA,$ $AB$ and $BP$ cause a drop in potential of $2 \mathrm{V}$.

Thus, the potential at $P=10-2-2-2=4 V$

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