An electron is traveling horizontally toward the north in a uniform magnetic field that is directed vertically downward. In what direction does the magnetic force act on the electron?
Question
An electron is traveling horizontally toward the north in a uniform magnetic field that is directed vertically downward. In what direction does the magnetic force act on the electron?
Solution
The direction of the magnetic force on a moving charge in a magnetic field is given by the right-hand rule. However, since electrons carry a negative charge, we use the left-hand rule.
Here are the steps to determine the direction of the force:
- Point your left thumb in the direction of the electron's motion, which is towards the north.
- Point your left index finger in the direction of the magnetic field, which is vertically downward.
- Your middle finger will then point in the direction of the force.
So, the magnetic force on the electron is directed towards the west.
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