Exam-style question
Try this first
What happens to cathode rays when they pass through a magnetic field?.
- A.They continue in a straight line.
- B.They are deflected in a circular path.
- C.They are absorbed by the field.
- D.They lose energy and stop.
Model answer
What a good answer should say
- They are deflected in a circular path.
Explanation
Why this works
The evidence from cathode ray experiments shows that cathode rays are deflected by magnetic fields, indicating they carry charge. This implies that charged particles experience a force in a magnetic field, leading to their circular motion.
Therefore, the correct interpretation is that the deflection confirms the presence of charged particles in cathode rays.
Common mistake
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