A-LevelPhysicsElectricityOct/Nov 2020Paper 1 Q331 Mark
Four point charges, each of charge Q, are placed on the edge of an insulating disc of radius r. The disc rotates at a rate of n revolutions per unit time. [Figure 33.1] What is the equivalent electric current at the edge of the disc?
A4Qn
B4Q / n
C8πrQn
D2Qn / (πr)
✓ 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...
📋 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