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Reply 1
\\I' - I = \frac{\epsilon}{R + \frac{r}{2}} - \frac{\epsilon}{R + r}[br]\\= \frac{\epsilon}{2}(\frac{r}{R^2 + \frac{3}{2}Rr + \frac{r^2}{4}}})[br]\\\approx \frac{\epsilon}{2}(\frac{1}{\frac{R^2}{r}})[br]\\= \frac{\epsilon r}{2R^2}
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