How will you use a gold leaf electroscope to find out whether a body is charged or uncharged?

When a charged rod is touched with the disc of a positively charged gold leaf electroscope, it is observed that the divergence of leaves decreases. What is the kind of charge on the rod?

How will you use a gold leaf electroscope to find out whether the charge on a charged body is positive or negative?

Describe Franklin's experiment. What did he conclude from his experiment?