\(\Rightarrow\) Gamma rays, being uncharged, are deflected by neither electric field nor magnetic field.
\(\Rightarrow\) Alpha particles, being positively charged, are deflected towards the negative plate in an electric field and the south pole in a magnetic field
\(\Rightarrow\) Beta particles are deflected towards the positive plate or the north pole (of a magnet) since they are negatively charged.
\(\Rightarrow\) Although both alpha and beta particles are deflected in electric and magnetic fields, it must be learnt that the deflection is more pronounced for beta particles, this is because they are light.
\(\Rightarrow\) Alpha particles \(\left({ }_2^1 \mathrm{He}\right.\) or \(\left.{ }_2^4 \alpha\right)\) are helium nuclei while beta particles \(\left({ }_{-1}^0\right.\) e or \(\left.{ }_{-1}^0 \beta\right)\) are streams of high energy electrons.