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Obtain an expression for electric potential ‘ ’ due to a point charge ‘ ’ at a distance .
Obtain an expression for electric potential ‘$V$’ due to a point charge ‘$Q$’ at a distance $r$.
To show: $V = \frac{1}{4\pi\varepsilon_0}\frac{Q}{r}$
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From ISC 2018 Specimen Physics Paper 1, question 14(a).