Exam-style question
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How does the deflection of cathode rays in an electric field support the idea that they are negatively charged?.
- A.They move towards the positive plate.
- B.They move towards the negative plate.
- C.They do not deflect at all.
- D.They are repelled by both plates.
Model answer
What a good answer should say
- They move towards the positive plate.
Explanation
Why this works
The evidence shows that cathode rays are attracted to the positive plate in an electric field, which indicates they are negatively charged. This implies that the direction of deflection is consistent with the behavior of negatively charged particles.
Thus, the conclusion is that cathode rays consist of negatively charged particles, supporting the discovery of the electron.
Common mistake
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