A-LevelPhysicsElectricity9702/12 · Feb/Mar 2019 · Q41 Mark
A digital balance is used to weigh ingredients in a laboratory. When a weight is applied to the digital balance, an electronic circuit generates a current which is then converted into a digital readout on the display. The electronic circuit gives a current of 2.0 mA when a weight of 30 N is applied, and a current of 0.5 mA when a weight of 5 N is applied. Which calibration curve could represent this circuit?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A[Diagram A shows current increasing with weight, starting at (0,0) and curving concave down, passing through (30,2)]
B[Diagram B shows current decreasing with weight, starting at (0,2) and curving concave up, passing through (30,0)]
C[Diagram C shows current increasing with weight, starting at (0,0) and curving concave up, passing through (30,2)]
D[Diagram D shows current decreasing with weight, starting at (0,2) and curving concave down, passing through (30,0)]
✓ Correct answer
A: [Diagram A shows current increasing with weight, starting at (0,0) and curving concave down, passing through (30,2)]
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