An electron enters a magnetic field acting vertically downward with velocity v from east. The electron is deflected along?
Answer: North
Explanation
Use Fleming’s Left-Hand Rule for the force on a charged particle in a magnetic field:- Index finger → direction of magnetic field (downward)
- Middle finger → direction of current (opposite to electron's velocity, so west)
- Thumb → direction of force (deflection)
Since the electron is negatively charged and moving east, the current is considered west.
The magnetic field is downward, so the force (thumb) points north.
Thus, the electron is deflected north.
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