Thomson's Cathode Ray Tube Experiment Video Lessons

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Problem: Cathode-ray tube with perpendicular magnetic and electric fields. The cathode rays (electrons) originate at the cathode and are accelerated toward the anode, which has a hole in its center. A narrow beam of electrons passes through the hole and travels to the fluorescent screen that glows when struck by a cathode ray.If no magnetic field were applied, would you expect the electron beam to be deflected upward or downward by the electric field?

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Opposites attract, similar repel


Electron

- negatively charged


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Problem Details

Cathode-ray tube with perpendicular magnetic and electric fields. The cathode rays (electrons) originate at the cathode and are accelerated toward the anode, which has a hole in its center. A narrow beam of electrons passes through the hole and travels to the fluorescent screen that glows when struck by a cathode ray.

An electron beam passes through the cathode and anode, and then through oppositely charged electrical plates. Electric and magnetic fields deflect the electron beam. The electron beam is undeflected if the electric and magnetic field strengths exactly balance each other, and the path of the electron can then reach the center of the fluorescent screen at the back of the tube.


If no magnetic field were applied, would you expect the electron beam to be deflected upward or downward by the electric field?

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