AS-Level OCR 2025 Physics B Paper 2

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AS-Level OCR 2025 Physics B Paper 2

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Wednesday 21 May 2025 – Afternoon
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AS Level
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Physics B (Advancing Physics) H157/02
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Physics in depth
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Time allowed: 1 hour 30 minutes




1
Turn over

, 2
Section A

1 A student carries out an experiment to determine the electromotive force (e.m.f.) and the internal
resistance of a cell. Fig. 1.1 shows the circuit the student uses.

Fig. 1.1




A V




The student changes the resistance of the variable resistor and measures corresponding values
of current through and potential difference across the variable resistor.

The graph in Fig. 1.2 shows the student’s results.

Fig. 1.2

1.60


1.50


1.40


1.30
Potential
difference 1.20
/V
1.10


1.00


0.90

0.80
0.00 0.10 0.20 0.30 0.40 0.50
Current / A




© OCR 2025

, 3
(a) The student concludes that the e.m.f. of the cell is 1.5 V and that its internal resistance is 1.2 Ω.
Explain how the student reaches these conclusions. Include any relevant calculations.

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...................................................................................................................................................................... [4]

(b)
(i) Show that when the current is 0.40A the number of electrons passing through the variable
resistor each second is 2.5 × 1018.




[2]

(ii) Calculate the energy transferred by one electron as it travels from one end of the variable resistor
to the other when the current is 0.40A.




Energy transferred = ...................................................... J [3]




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