If the beta particle had been a positron, the new nucleus formed would have a positive charge. This is because a positron is a positively charged particle with the same mass as an electron. During beta decay, a neutron transforms into a proton, and if the beta particle is a positron, it is emitted from the nucleus, resulting in an increase in the number of protons. Since protons have a positive charge, the overall charge of the new nucleus would be positive.
