Alternative to Practical: show readings, units and working. For a plotted graph or circuit diagram, upload a clear image of your work on the supplied figure.
(a)Read question and case materials as text
Text can be resized with your browser. Refer to the original figures below for diagrams and their layout.
A student uses the circuit in Fig. 3.1 to investigate how supply terminal voltage V changes with current I by moving a flying lead along a resistance wire.
Fig. 3.2 shows the open-circuit voltmeter for Fig. 3.1. Record the initial terminal potential difference V₀ in V.
A student uses the circuit in Fig. 3.1 to investigate how supply terminal voltage V changes with current I by moving a flying lead along a resistance wire.
Fig. 3.1Fig. 3.2
Fig. 3.2 shows the open-circuit voltmeter for Fig. 3.1. Record the initial terminal potential difference V₀ in V.
[1 mark]
(b)Read question and case materials as text
Text can be resized with your browser. Refer to the original figures below for diagrams and their layout.
A student uses the circuit in Fig. 3.1 to investigate how supply terminal voltage V changes with current I by moving a flying lead along a resistance wire.
With the flying lead at d=100.0 cm and V=2.3 V, Fig. 3.3 shows the ammeter. Record current I in A.
With the flying lead at d=100.0 cm and V=2.3 V, Fig. 3.3 shows the ammeter. Record current I in A.
Fig. 3.3
[1 mark]
(c)
Complete Table 3.1 with units in all three headings and your current from (b) in the first row. Other printed rows are d/cm,V/V,I/A: (80.0,2.2,0.37),(60.0,2.0,0.45),(40.0,1.7,0.60),(20.0,1.2,0.88).
Table 3.1 — fill the first current and heading units
d / ___
V / ___
I / ___
100.0
2.3
…
80.0
2.2
0.37
60.0
2.0
0.45
40.0
1.7
0.60
20.0
1.2
0.88
Swipe sideways to see all columns.
Answer guidance
Complete Fill in every gap. A partly completed answer usually scores partly.
[1 mark]
(d)Read question and case materials as text
Text can be resized with your browser. Refer to the original figures below for diagrams and their layout.
A student uses the circuit in Fig. 3.1 to investigate how supply terminal voltage V changes with current I by moving a flying lead along a resistance wire.
On the original blank Fig. 3.4 grid, plot terminal V on the y-axis against current I on the x-axis using Table 3.1, with both axes from the origin. Draw a thin straight line of best fit.
On the original blank Fig. 3.4 grid, plot terminal V on the y-axis against current I on the x-axis using Table 3.1, with both axes from the origin. Draw a thin straight line of best fit.
Fig. 3.4
Answer guidance
Draw Accuracy is being marked. Use the figure and be precise about position and labels.
[3 marks]
(e)(i)
Use a large triangle on your Fig. 3.4 line to calculate its gradient m, showing your chosen values and working on the graph. Its magnitude equals supply resistance.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[2 marks]
(e)(ii)
Extend your Fig. 3.4 best-fit line to the y-axis and record its intercept, the emf V₀ in V.
[1 mark]
(f)
Compare the direct V₀ reading from (a) with your graph intercept from (e)(ii). Calculate their percentage difference and state whether they agree within 10%.
Answer guidance
Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.
[2 marks]
(g)
Suggest a practical reason not to connect the flying lead less than 20.0 cm from end X of the wire in Fig. 3.1.
Answer guidance
Suggest More than one answer may be acceptable, so long as it is consistent with the physics.
[1 mark]
(h)Read question and case materials as text
Text can be resized with your browser. Refer to the original figures below for diagrams and their layout.
A student uses the circuit in Fig. 3.1 to investigate how supply terminal voltage V changes with current I by moving a flying lead along a resistance wire.
Complete the original Fig. 3.5 circuit to replace the resistance-wire section with a variable resistor. Show the variable-resistor symbol and correct connections, retaining the ammeter and supply voltmeter.
Complete the original Fig. 3.5 circuit to replace the resistance-wire section with a variable resistor. Show the variable-resistor symbol and correct connections, retaining the ammeter and supply voltmeter.
Fig. 3.5
Answer guidance
Show The result is given, so every step of the reasoning is what earns the marks.
[2 marks]
5054/42/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 4 variant 2 · Question 3