Final answer:
Neutrons and gamma rays are unaffected by electrical fields due to their lack of charge, unlike alpha and beta particles which are deflected.
Step-by-step explanation:
When nuclear emissions are passed through a positive plate and a negative plate, neutrons and gamma rays are deflected toward neither plate. Alpha particles are attracted to the negative plate due to their positive charge and are deflected by a small amount. Beta particles are attracted to the positive plate due to their negative charge and are deflected by a large amount. Both neutrons and gamma rays are uncharged, which is why they are not deflected in an electric field. Neutrons, being neutral particles, would not be attracted to either plate, and gamma rays, being high-energy photons, also carry no charge and thus are unaffected by the electric field.