Exam-style question
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How does the behavior of cathode rays in magnetic fields provide evidence for their charge?.
Model answer
What a good answer should say
- When cathode rays pass through a magnetic field, they curve in a direction that depends on the orientation of the field, indicating that they are negatively charged particles.
- This behavior aligns with the right-hand rule, where the direction of the force on a charged particle is determined by its charge and the magnetic field direction.
Explanation
Why this works
This answer effectively links the observed behavior of cathode rays in magnetic fields to their charge, demonstrating an understanding of the principles of electromagnetism. It tests the student's ability to apply theoretical knowledge to practical observations.
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