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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 [2006
  • a)
  • b)
  • c)
    r1 + r2
  • d)
    r1 - r2
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Two cells, having the same e.m.f., are connected in series through an ...
Two cells of emf ? are connected in series through external resistance R.
Thus, total resistance is R + r1 + r2

 Thus, current across the circuit is total voltage divided by total resistance.

Now, when circuit is closed, the voltage across first cell is zero. Thus, we have

This is the value of R in terms of r1 and r2.
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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 [2006a)b)c)r1 + r2d)r1 - r2Correct answer is option 'D'. Can you explain this answer?
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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 [2006a)b)c)r1 + r2d)r1 - r2Correct answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about 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 [2006a)b)c)r1 + r2d)r1 - r2Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 [2006a)b)c)r1 + r2d)r1 - r2Correct answer is option 'D'. Can you explain this answer?.
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