A-LevelPhysicsElectricity9702/12 · Oct/Nov 2014 · Q321 Mark
A pencil is used to draw a line of length 30 cm and width 1.2 mm. The resistivity of the material in the pencil is 2.0 × 10⁻⁵ Ω m and the resistance of the line is 40 kΩ. What is the thickness of the line?
A1.25 × 10⁻¹⁰ m
B1.25 × 10⁻⁸ m
C1.25 × 10⁻⁷ m
D1.25 × 10⁻⁵ m
✓ Correct answer
C: 1.25 × 10⁻⁷ m
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