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I have been working on this given question for a while now, and it's supposed to be really easy, but I can't get the answer can you sort of guide me through this question, and show me the steps and equations you used?

Question: At what distance from a point charge of 8.0 x 10^-6 C would the electrical potential be 4.2 x 10⁴ V?

Please explain each step and equations used to solve the above question.

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