Exam-style question
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Explain how the deflection of cathode rays in magnetic fields supports the idea that they are composed of charged particles.
Model answer
What a good answer should say
- The deflection of cathode rays in magnetic fields occurs at right angles to both the magnetic field and the direction of the rays, which is consistent with the behavior of charged particles.
- This indicates that the particles in the cathode rays possess charge, as they experience a force due to the magnetic field.
Explanation
Why this works
This answer effectively links the observed deflection of cathode rays in magnetic fields to the presence of charged particles. The question assesses the ability to connect experimental evidence to theoretical concepts in physics.
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