In order to measure the internal resistance r_{1} of a cell of emf E, a meter bridge of wire resistance R_{0}=50 Ω, a resistance R_{0} / 2, another cell of emf E / 2 (internal resistance r ) and a galvanometer G are used in a circuit, as shown in the figure.If the null point is found at l=72 {cm}, then the value of r_{1}= _______________Ω. [JEE Adv 2021 P2]

Current Electricity

Section: Physics

Question : 5 of 29

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In order to measure the internal resistance r1 of a cell of emf E, a meter bridge of wire resistance R0=50Ω, a resistance

, another cell of emf

(internal resistance r ) and a galvanometer G are used in a circuit, as shown in the figure.If the null point is found at l=72cm, then the value of r1= _______________Ω.

[JEE Adv 2021 P2]

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