A-LevelPhysicsElectricity9702/12 · May/June 2017 · Q41 Mark

The current in a block of semiconductor is 30.0 mA when there is a potential difference (p.d.) of 10.0 V across it. The dimensions of the block and the direction of the current in it are as shown. [Diagram shows a block with dimensions 15.0 mm (width), 15.0 mm (height), and 30.0 mm (length). A current of 30.0 mA flows along the 30.0 mm length.] The electrical meters used are accurate to ± 0.1 mA and ± 0.1 V. The dimensions of the block are accurate to ± 0.2 mm. What is the resistivity of the semiconductor?

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A10.0 ± 0.2 Ωm

B10.0 ± 0.3 Ωm

C10.0 ± 0.5 Ωm

D10.0 ± 0.8 Ωm

✓ Correct answer

C: 10.0 ± 0.5 Ωm

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2017 Paper 1 Variant 2, question 4.

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