Exam-style question
Try this first
How do cathode rays behave in magnetic fields, and what does this indicate?.
- A.They are attracted to the positive pole, indicating they are negatively charged.
- B.They are repelled by the positive pole, indicating they are positively charged.
- C.They do not change direction, indicating they have no charge.
- D.They are attracted to the negative pole, indicating they are neutral.
Model answer
What a good answer should say
- They are attracted to the positive pole, indicating they are negatively charged.
Explanation
Why this works
The evidence shows that cathode rays are attracted to the positive pole in a magnetic field, which indicates that they carry a negative charge. This implies that the particles in cathode rays are electrons, confirming their role in the structure of atoms.
Common mistake
No common mistake is linked to this question yet.