Question

what is electroscope charging by conduction

Answer 1

When the process of charging by conduction is complete, the electroscope acquires an excess negative charge due to the movement of electrons onto it from the metal sphere. The metal sphere is still charged negatively, only it has less excess negative charge than it had prior to the conduction charging process.

Answer 2

when the process of charging by the conduction is complete, the electroscope acquires an excess -ve charge (due to flow of electron from metal)