Physics 9702 · AS & A Level · Practical circuits

Practical circuits — practice question

A cell with internal resistance $r$ and electromotive force (e.m.f.) $E$ is arranged in series with a resistor of resistance $R$. The resistance $R$ and the e.m.f. $E$ stay constant. The cell’s internal resistance $r$ varies with time. Which graph best represents how the current $I$ in the circuit changes with internal resistance $r$?

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