# Potential of a Cube

Consider the potential $$V$$ and magnitude $$E$$ of an electric field at the vertex $$P$$ of a uniformly charged cube of side length $$2s.$$ Now, a cube of side length $$s$$ (also with $$P$$ as a vertex) is removed from the larger cube.

The new potential and magnitude of the electric field at $$P$$
are $$\dfrac{V}{x}$$ and $$\dfrac{E}{y},$$ respectively. What is $$3xy?$$

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