A battery has electromotive force (e.m.f.) 4.0V and internal resistance 0.35Ω. The battery is connected to a uniform resistance wire XY and a fixed resistor of resistance R, as shown in Fig. 5.1.
[Figure 5.1]
Wire XY has resistance 0.90 Ω. The potential difference across wire XY is 1.8V.
A cell of e.m.f. 1.2V is connected to the circuit in (b), as shown in Fig. 5.2.
[Figure 5.2]
The connection P is moved along the wire XY. The galvanometer reading is zero when distance XP is 0.30 m.

Q: What topic does this question test?

This question tests D.C. circuits in A-Level Physics (syllabus code 9702). It is worth 11 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2021 examination, Paper 2 Variant 1 (9702_s21_qp_21.pdf).

Question

A battery has electromotive force (e.m.f.) 4.0V and internal resistance 0.35Ω. The battery is connected to a uniform resistance wire XY and a fixed resistor of resistance R, as shown in Fig. 5.1.
[Figure 5.1]
Wire XY has resistance 0.90 Ω. The potential difference across wire XY is 1.8V.
A cell of e.m.f. 1.2V is connected to the circuit in (b), as shown in Fig. 5.2.
[Figure 5.2]
The connection P is moved along the wire XY. The galvanometer reading is zero when distance XP is 0.30 m.

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