A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2022 · Q341 Mark
A cell of electromotive force (e.m.f.) E and internal resistance r is connected to a variable resistor, as shown. [Figure 34.1] The resistance of the variable resistor is gradually increased from r to 3r. Which graph shows the variation of the potential difference (p.d.) v across the internal resistance with the p.d. V across the variable resistor?
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AGraph of v vs V, starts at (0, E/2) and ends at (3E/4, E/4), straight line with negative gradient
BGraph of v vs V, starts at (0, E) and ends at (E, 0), straight line with negative gradient
CGraph of v vs V, starts at (E/2, E/2) and ends at (3E/4, E/4), straight line with negative gradient
DGraph of v vs V, starts at (0, E) and ends at (E, 0), straight line with negative gradient
✓ Correct answer
A: Graph of v vs V, starts at (0, E/2) and ends at (3E/4, E/4), straight line with negative gradient
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