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4.18. (a) A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say about the initial velocity of the particle?
Answers (1)
The charged particle is not deflected by the magnetic field even while having a non-zero velocity; therefore, its initial velocity must be either parallel or anti-parallel to the magnetic field, i.e., its velocity is either in the east or west direction.
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