Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is

Question

Two cells of emf 2E and E with internal resistance r₁ and r₂ respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is

r₁ $-$ r₂

${{{r_1}} \over 2} - {r_2}$

${{{r_1}} \over 2} + {r_2}$

r₁ + r₂

Solution

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