What will you observe when the metal top of an electroscope is touched with a glass rod which has been rubbed with silk cloth? Give reason for your answer.

When a glass rod is rubbed with a silk cloth, it acquires positive charge. When it is touched with the metal top of an electroscope, both the metal top and leaves acquires a positive charge due to conduction. As a result of the positive charge on both the leaves, the divergence of leaves takes place.