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The answer is true (I looked up the key), but I do not understand why.

I know that the spheres, due to being unequally sized, have different charges. But I thought potential was EPE/q, which is (Qq/r)/q, which simplifies to Q/r. If the spheres have different charges, won't the potential always be different? Can someone help explain why the potentials would be the same?

Thanks!