A charged object is obtained by rubbing glass rod with silk or otherwise as discussed in previous lesson. Now you will see how the conductor can conduct with the potential in this charged object.
The conductor does not need to come to contact with the charged insulator. The free electrons in the conductor will be pushed by the charged insulator by means of electrostatic field as they are free to move by this field or force created within the conductor material. As a result, you will have the conductor one side filled with electrons and the other side deprived of electrons, that is, the positrons or positive nuclei left on the opposite side.