Opposites attract, similar repel
- negatively charged
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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