Alpha particles are positively charged, so they will be deflected by a magnetic field. The magnitude of the deflection will depend on the strength of the magnetic field and the velocity of the alpha particles. Because alpha particles are relatively massive and have a relatively large charge, they will experience a larger force and greater deflection in a magnetic field than other particles with the same velocity.
tskir t1_iz58n12 wrote
Reply to How do alpha particles react to strong magnetic fields? by primitive_missionary
Alpha particles are positively charged, so they will be deflected by a magnetic field. The magnitude of the deflection will depend on the strength of the magnetic field and the velocity of the alpha particles. Because alpha particles are relatively massive and have a relatively large charge, they will experience a larger force and greater deflection in a magnetic field than other particles with the same velocity.