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(D) For cells connected in parallel,the equivalent emf $\varepsilon_{eq}$ and equivalent internal resistance $r_{eq}$ are given by the formula: $\frac

Vedclass · Accepted Answer

$24$

Vedclass · Answer

(D) For cells connected in parallel,the equivalent emf $\varepsilon_{eq}$ and equivalent internal resistance $r_{eq}$ are given by the formula: $\frac{\varepsilon_{eq}}{r_{eq}} = \sum \frac{\varepsilon_i}{r_i} = \frac{\varepsilon_1}{r_1} + \frac{\varepsilon_2}{r_2} + \frac{\varepsilon_3}{r_3}$ Substituting the given values: $\frac{\varepsilon_{eq}}{r_{eq}} = \frac{1.2}{0.1} + \frac{1.4}{0.2} + \frac{1.5}{0.3}$ $\frac{\varepsilon_{eq}}{r_{eq}} = 12 + 7 + 5$ $\frac{\varepsilon_{eq}}{r_{eq}} = 24 \ V \Omega^{-1}$ Thus,the correct option is $D$.

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