Physics · Oct / Nov 2025 · Paper 62 · Question 2
0625
As printed in the paper
The question as text
A student investigates an electric circuit to find the resistance of an unknown resistor Z. The student sets up the incomplete circuit shown in Fig. 2.1. There is a gap between the points labelled X and Y. V X Z Y + – Fig. 2.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
2(a)[1]
4.4(0) (V)
2(b)(i)[2]
0.135 /0.14 (A)
0.14 (A)
2(b)(ii)[1]
3.0(1)
2(c)[4]
scales labelled with quantity and unit, correct way around
suitable scales (occupying at least ½ the grid)
plots correct to ± ½ small square and precise plots
good best-fit line judgement, thin, continuous line
2(d)[2]
indication on the graph as to how gradient found and correct method of calculation of gradient i.e. Δy / Δx
at least ½ the distance between the extreme plotted points used
(ΔI ≥ 0.045)
2(e)[1]
any integer from 19–25 inclusive
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