A-LevelPhysicsD.C. circuitsMay/June 2014Paper 1 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?
A395 Ω
B795 Ω
C995 Ω
D1055 Ω
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The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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