Exam-style question
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How can the charge-to-mass ratio of an electron be determined using electric and magnetic fields?.
- A.By measuring the radius of the circular path in a magnetic field.
- B.By measuring the voltage across the electron beam.
- C.By measuring the temperature of the electron source.
- D.By measuring the time taken for the electron to travel a distance.
Model answer
What a good answer should say
- By measuring the radius of the circular path in a magnetic field.
Explanation
Why this works
The charge-to-mass ratio can be determined by observing the radius of the circular path of an electron in a magnetic field, using the relationship between the magnetic force and centripetal force acting on the electron.
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