Question

f an electron moves in a magnetic field, it always feels a force. it only feels...

f an electron moves in a magnetic field,

it always feels a force.

it only feels a force if its velocity vector is parallel (or antiparallel) to the direction of the 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.
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Answer #1

The magnetic force acting on a charge, if it is moving in a magnetic field.

Where q=charge, v = velocity, B = Magnetic field, Theta = angle between velocity vector and magnetic field.

If , Fm = 0.... i.e Magnetic force will be zero, if the velocity vector is parallel or anti-parallel with magnetic field direction.

If , then

i.e The charge feels a force if its velocity vector is not parallel (or antiparallel) to the direction of the magnetic field.

Therefore, Answer is ---- Option (3)

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