The effect of any charged particle in an electric and/or magnetic field can be calculated using the Lorentz Force:
F = qE + q v x B
So the alpha particle will be attracted to a negatively charged grid, while a magnetic field will cause it to deflect in circular motion. Note that no matter how strong a B field you make it, the alpha particle will continue to drift toward the negative grid.
CosmoSounder t1_iz832fx wrote
Reply to How do alpha particles react to strong magnetic fields? by primitive_missionary
The effect of any charged particle in an electric and/or magnetic field can be calculated using the Lorentz Force:
F = qE + q v x B
So the alpha particle will be attracted to a negatively charged grid, while a magnetic field will cause it to deflect in circular motion. Note that no matter how strong a B field you make it, the alpha particle will continue to drift toward the negative grid.