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JEE Main202623 January 2026Evening ShiftPhysicsCurrent ElectricityActual

To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm. The least count of scale is 1 cm. The percentage error in the ratio of EMFs is _ _ _ _ .

Options

  1. A1.65
  2. B1.45
  3. C1.75
  4. D1.16

Correct answer

D. 1.16

Step-by-step solution

= (Potential gradient) ₁ = ₁ ₂ = ₂ y = ₁ ₂ = ₁ ₂ y y = ₁ ₁ + ₂ ₂ y y = 1 200 + 1 150 y y 100 = ( 1 200 + 1 150 ) 100 = ( 3+4 600 ) 100 = 7 6 = 1.16 %

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