If an electron moves in a magnetic field, it only feels a force if its velocity
ID: 2285967 • Letter: I
Question
If an electron moves in a magnetic field,
it only feels a force if its velocity vector is not parallel (or antiparallel) to the direction of the magnetic field.
it does not feel a force if it is in motion, only if stationary.
it only feels a force if its velocity vector is parallel (or antiparallel) to the direction of the magnetic field.
it always feels a force.
a.it only feels a force if its velocity vector is not parallel (or antiparallel) to the direction of the magnetic field.
b.it does not feel a force if it is in motion, only if stationary.
c.it only feels a force if its velocity vector is parallel (or antiparallel) to the direction of the magnetic field.
d.it always feels a force.
Explanation / Answer
For a charged particle movingwith velocity v in magnetic field B
force = Bvq sin(theta)
therefore, force is zero for theta = 0 .
Hence, correct option is
it only feels a force if its velocity vector is not parallel (or antiparallel) to the direction of the magnetic field.
a.it only feels a force if its velocity vector is not parallel (or antiparallel) to the direction of the magnetic field.
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