Rutherford used alpha particles in his experiment. The charge of alpha particles is _________.

The correct option is A 2
An alpha-particle is identical to the nucleus of a normal helium atom i.e., $H{e}^{2+}$.
Alpha particles consist of two protons and two neutrons. Protons are positively charged and neutrons are neutral in nature.
Hence, the charge of alpha particles is +2.