Two cells each of emf E and internal resistance r1 and r2 respectively are connected in series with an external resistance R.

Two cells each of emf E and internal resistance r₁ and r₂ respectively are connected in series with an external resistance R. The potential difference between the terminals of the first cell will be zero when R is equal to

(A) r₁ + r₂/2

(B) √r₁² - r₂²

(D) r₁r₂/r₁ + r₂

Two cells each of emf E and internal resistance r1 and r2 respectively are connected in series with an external resistance R.

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