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NTA Abhyas JEE Main2020PhysicsCurrent ElectricityPractice

A cell of emf E having an internal resistance 'r' is connected to an external resistance R. The potential difference 'V' across the resistance R varies with R as shown by the curve:

Options

  1. AA
  2. BB
  3. CC
  4. DD

Correct answer

B. B

Step-by-step solution

V = E - ir = - Er R + r = E R + r - r R + r V = ER R + r ⇒ V = 0 at R = 0 V = E at R = ∞

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