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CosmoSounder t1_iz832fx wrote

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.

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