Two pieces of silk have an electron charge after being rubbed on a piece of

When the silk is rubbed against the amber, the silk loses electrons to the amber making the silk positve charge and the amber have a negiitve charge.
when you put both positive charged pieces of silk near each other they will repel each other becasue they have the same charge
law of repulsion states that like charges repel
Hope this helps!

-Payshence xoxo