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JEE Main20244 Apr 2024Morning ShiftPhysicsCurrent ElectricityActual

To measure the internal resistance of a battery, potentiometer is used. For R =10 , the balance point is observed at l=500 ~cm and for R =1 the balance point is observed at l=400 ~cm . The internal resistance of the battery is approximately :

Options

  1. A0.2
  2. B0.3
  3. C0.4
  4. D0.1

Correct answer

B. 0.3

Step-by-step solution

Let potential gradient be . aligned & i 10= 500= - ir _ s & 500 = -50 r _ s aligned Also, aligned & i ^ 1= 400= - i ^ r _ s & 400 = -400 r ₅ & 100 =350 r _ s r _ s = 10 35 0.3 aligned

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