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Obtain an expression for electric potential (V) at a point near a point charge ‘Q’. (Recall)
Given: Point charge Q at origin and test charge $+1\text{ C}$ at distance x
To show: $V = \frac{1}{4\pi\epsilon_0} \frac{Q}{r}$
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From ISC 2026 Specimen Physics Paper 1, question 9.