In a potentiometer experiment, r = (l₀ − l)R/l, where l₀ is the open-circuit balance length, l is the balance point and r is the internal resistance. A graph of 1/R against 1/l has slope 8 and intercept magnitude 4. Calculate r if l₀ = 200 cm.

University of Ilorin PHY107 2026-exam past question

1. 2.5 Ω
2. 0.25 Ω
3. 25 Ω
4. 250 Ω

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