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Two cells of same emf but different internal resistances r₁ and r₂ are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero is

Asked in JEE Main 25th June 2nd Shift 2022 · Combination of cells

• (1) r₂-r₁
• (2) r₁-r₂
• (3) r₁
• (4) r₂

Step-by-step solution

Why the other options are wrong

• (2) Applies the zero-voltage condition to the first cell instead of the second.
• (3) No standard slip gives this; it would need r₂=2r₁.
• (4) No standard slip gives this; it would need r₁=0.

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