How can you charge a metal sphere negatively without touching it?

Explanation

Shows an unchaged metallic spere on an inlsulating metal stand brign a negatively chaged rod close to the metallic spere as the rod is brought close distrubution sptops when the net force on the free electrons inside the metal is zero connect the spere to the ground by a conducting the negative chages one the rod held at the near end remove the electrifield rod the postive charge will spread uniformly over the sphere as

in this experiment the metal sphere gets charged by the process of induction and the rod does not lose any of its charge by induction by bringing a psotiviely charged rod near it in this spereh is connected to the ground with a wire can you explain why