Which one of the following conditions is not a requirement for a particle to experience a magnetic force when placed in a magnetic field?
a) The particle must be moving.
b) The particle must be charged.
c) The particle must not be under the influence of any other forces.
d) The velocity of the particle must have a component that is perpendicular to the direction of the magnetic field.
Ans: c) The particle must not be under the influence of any other forces.
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