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JEE Main2005PhysicsCurrent ElectricityActual

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R₁ and R₂ (R₂>R₁ ) . If the potential difference across the source having internal resistance R ₂ is zero, then

Options

  1. A. R = R ₂ ( R ₁+ R ₂ ) / R ₂- R ₁ )
  2. BR = R ₂- R ₁
  3. CR = R ₁ R ₂ / ( R ₁+ R ₂ )
  4. DR = R ₁ R ₂ / ( R ₂- R ₁ )

Correct answer

B. R = R ₂- R ₁

Step-by-step solution

I = 2 E R ₁+ R ₂+ R E - R ₂ I =0 R = R ₂- R ₁

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