A-LevelPhysicsD.C. circuits9702/12 · May/June 2014 · Q351 Mark

A power supply and a solar cell are compared using the potentiometer circuit shown. [Figure 35.1] The e.m.f. produced by the solar cell is measured on the potentiometer. The potentiometer wire PQ is 100.0 cm long and has a resistance of 5.00 Ω. The power supply has an e.m.f. of 2.000 V and the solar cell has an e.m.f. of 5.00 mV. Which resistance R must be used so that the galvanometer reads zero when PS = 40.0 cm?

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A395 Ω

B795 Ω

C995 Ω

D1055 Ω

✓ Correct answer

B: 795 Ω

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2014 Paper 1 Variant 2, question 35.

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