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Force \vec{F} on a charged particle which is moving with velocity \vec{v} in a magnetic field  \vec{B} is given by :
  \vec{F}=q\ \vec{v}\ X\ \vec{B}=q\ (v_x\ \hat{i} + v_y\ \hat{j}) X B_z \hat{k} \\\\=q\ B_z\ (v_y \hat{i} - v_x\ \hat{j})

Since, the velocity and magnetic fields are perpendicular, the particle experiences a constant force, perpendicular to B and v.  There is a constant acceleration in x-y plane always perpendicular to the velocity.  Hence the charged particle moves in a circular path of a fixed radius and center.

If the charged particle has a velocity component in z direction also, then it will move in a helical path.

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