A charged particle is moved along a magnetic field line. The magnetic force on the particle is

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zero The force on a charged particle q moving with velocity v in a magnetic field B is given by \vec{F} = q( \vec{v} $\times$ \vec{B} ) As the charge is moving along the magnetic line of force, the velocity and magnetic field vectors will point in the same direction, making a cross product. ( \vec{v} $\times$ \vec{B} ) = 0 \Rightarrow \vec{F} = 0 So, the magnetic force on the particle will be zero.

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