JEE Main 2024 April 4, Morning Session Q.(9) 

To measure the internal resistance of a battery, potentiometer is used. For R1 = 10Ω, the balance point is observed at l1 = 500cm and for R2 = 1Ω the balance point is observed at l2 = 400 cm. The internal resistance
of the battery is approximately:
(1)0.1Ω (3)0.3Ω
(2)0.2 Ω (4)0.4Ω
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