A-LevelPhysicsElectricityFeb/Mar 2019Paper 1 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?
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
The correct answer is A. This question tests the candidate's understanding of electricity within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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