A-LevelPhysicsElectricityOct/Nov 2019Paper 1 Q311 Mark
When the current in a wire is 5.0 A, the average drift speed of the conduction electrons in the wire is 7.4 × 10⁻⁴ m s⁻¹. Which row gives a possible cross-sectional area and number of conduction electrons per unit volume for this wire?
A7.2 × 10⁻⁷ m², 1.2 × 10²⁸ m⁻³
B7.2 × 10⁻⁷ m², 5.9 × 10²⁸ m⁻³
C2.3 × 10⁻⁶ m², 7.3 × 10²⁶ m⁻³
D2.3 × 10⁻⁶ m², 3.7 × 10²⁷ m⁻³
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of electricity within the Physicssyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep