Just a question regarding static electricity. When charging a metal conductor positively; it's relatively simple. A negative rod is put to the top of it, which causes the positive protons to move to the bottom and then a finger is used to earth the electrons at the top (while the rod prevents the protons from neutralizing it, allowing the electrons to leave). How do we negatively charge it though? Some marking schemes seem to say you do the exact same thing, but how can we earth protons? We learned in class that the protons will not be earthed; only electrons can be.