A student is investigating a rotary variable resistor, as shown in Fig. 2.1. [Figure 2.1] The variable resistor is connected to a battery of electromotive force (e.m.f.) E and negligible internal resistance, as shown in Fig. 2.2. [Figure 2.2] The student uses a protractor to measure the angle θ through which the spindle of the variable resistor is rotated and records the current I. The experiment is repeated for different angles. It is suggested that I and θ are related by the equation E = IKθ where K is a constant.

Q: What topic does this question test?

This question tests D.C. circuits in A-Level Physics (syllabus code 9702). It is worth 15 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2019 examination, Paper 5 Variant 1 (9702_s19_qp_51.pdf).

Question

A student is investigating a rotary variable resistor, as shown in Fig. 2.1. [Figure 2.1] The variable resistor is connected to a battery of electromotive force (e.m.f.) E and negligible internal resistance, as shown in Fig. 2.2. [Figure 2.2] The student uses a protractor to measure the angle θ through which the spindle of the variable resistor is rotated and records the current I. The experiment is repeated for different angles. It is suggested that I and θ are related by the equation E = IKθ where K is a constant.

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