In an experiment to determine the internal resistance (r) of a cell using a potentiometer, the relationship between the external resistance R, the open-circuit balancing length l₀ and the closed-circuit balancing length l is r = (l₀ − l)R/l. Linearise the plot of 1/R against 1/l.

University of Ilorin PHY107 2026-exam past question

1. 1/R = (l₀ − l)/rl
2. 1/R = l/R
3. 1/R = l₀/rl − 1/r
4. 1/R = l₀/rl + 1/r

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