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NEET2006PhysicsCurrent ElectricityActual

Two cells, having the same e.m.f. are connected in series through an external resistance R . Cells have internal resistances r₁ and r₂ (r₁>r₂ ) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:

Options

  1. Ar₁+r₂
  2. Br₁-r₂
  3. Cr₁+r₂ 2
  4. Dr₁-r₂ 2

Correct answer

B. r₁-r₂

Step-by-step solution

According to the question E-I r₁=0 and I = E+E r₁+r₂+R array l E r₁ = 2 E r₁+r₂+R r₁+r₂+R =2 r₁-r₂ R =r₁-r₂ array

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