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Standard X

Physics

EMF and Terminal Voltage

ntnttA potent...

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ntnttA potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4m long. When the resistance, R, connected across the given cell, has values of. (i) infinity (ii) 9.5 Ω the 'balancing lengths', on the potentiometer wire are found to be 3 m and 2.85 m, respectively. The value of internal resistance of the cell isnn nt ntt nttt(1) 0.25 Ω (2) 0.95 Ωnttt(3) 0.5 Ω (4) 0.75 Ωntnn ntn

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