It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving (i) $\alpha $-particles, (ii) neutrons? Justify your answer.
In case of movement of a charged particle the magnetic field is created around the path on which the charged particle moves.
(i) Yes, a thin beam of a-particles (which are positively charged) is like straight conductor carrying current in the direction of motion.
(ii) No, as neutrons carry no charge so no magnetic field would be created around its path.