The emf of a single battery which is equivalent to a parallel combi...

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The emf of a single battery which is equivalent to a parallel combination of two batteries of emfs \( 5 \mathrm{~V} \) and \( 10 \mathrm{~V} \) and internal resistances \( 1 \Omega \) and \( 2 \Omega \) respectively connected as shown in figure is
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