A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2021 · Q361 Mark

A cell that has internal resistance is connected to a switch S and a variable resistor. A voltmeter is connected between the terminals of the cell, as shown. [Figure 36.1] When switch S is open, the voltmeter reads 1.5 V. The switch is then closed and the variable resistor is adjusted to have a resistance of 4.0 Ω. The voltmeter now reads 0.75 V. What is the internal resistance of the cell?

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A1.0 Ω

B2.0 Ω

C4.0 Ω

D8.0 Ω

✓ Correct answer

C: 4.0 Ω

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 36.

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