Exam-style question
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An electron is moving vertically upwards in a magnetic field that points to the north. Using the right-hand rule, determine the direction of the magnetic force acting on the electron.
Model answer
What a good answer should say
- The magnetic force acting on the electron is directed towards the west.
Explanation
Why this works
This question assesses the application of the right-hand rule for negatively charged particles. The thumb points upwards (direction of velocity), fingers point north (direction of the magnetic field), and since the electron is negatively charged, the force direction is opposite to the palm, resulting in a force directed west.
Common mistake
No common mistake is linked to this question yet.