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Current Electricity question

2006 · Q132
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Current Electricity question

2006 · Q132

NEETPhysicsCurrent ElectricityMCQ+4 / −1
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
  1. A
    r1 + r2
  2. B
    r1 −-− r2
  3. C
    r1+r22{{{r_1} + {r_2}} \over 2}2r1​+r2​​
  4. D
    r1−r22{{{r_1} - {r_2}} \over 2}2r1​−r2​​
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