A-LevelPhysicsD.C. circuitsFeb/Mar 2021Paper 1 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?
A1.0 Ω
B2.0 Ω
C4.0 Ω
D8.0 Ω
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The correct answer is C. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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