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Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R1and R2 (R1  > R1). If the potential difference across the source having internal resistance R2 is zero, then
  • a)
    R = R2 -R1
  • b)
    R = R2*( R1 + R2) /(R2-R1)
  • c)
    R = R1R2 /( R2 -R1)
  • d)
    R = R1R2 /( R1 -R2)
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Two sources of equal emf are connected to an external resistance R. Th...
Potential difference across second cell  = V = ε – IR2 = 0
R + R1 + R 2 - 2R 2 = 0
R + R1 - R 2 = 0   ∴ R = R 2 - R1
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Most Upvoted Answer
Two sources of equal emf are connected to an external resistance R. Th...
Explanation:

Given:
- Emf of both sources: E
- External resistance: R
- Internal resistances: R1, R2 (where R1 > R2)
- Potential difference across source with R2: 0

Analysis:
- The total resistance in the circuit can be represented as R + R1 for one source and R + R2 for the other source.
- Since the potential difference across the source with internal resistance R2 is zero, the emf of that source is balanced by the potential drop across its internal resistance R2.

Solution:
- When the potential difference across the source with internal resistance R2 is zero, the current flowing through that source is E / (R + R2).
- The potential drop across the internal resistance R1 is I * R1 = E * R1 / (R + R2).
- Since the potential difference across the source with internal resistance R2 is zero, the potential drop across its internal resistance is equal to the emf, i.e., E * R1 / (R + R2) = E.
- Solving for R, we get R = R2 - R1.
Therefore, the correct answer is option 'A' (R = R2 - R1).
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Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R1and R2 (R1 > R1). If the potential difference across the source having internal resistance R2 is zero, thena)R = R2 -R1b)R = R2*( R1 + R2) /(R2-R1)c)R = R1R2 /( R2 -R1)d)R = R1R2 /( R1 -R2)Correct answer is option 'A'. Can you explain this answer?
Question Description
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