Q 1.11(b): A polythene piece rubbed with wool is found to have a negative charge of . Is there a transfer of mass from wool to polythene?
The charge attained by polyethene (and also wool!) is solely due to the transfer of free electrons.
We know, Mass of an electron =
The total mass of electron transferred = Number of electrons transferred x Mass of an electron
Yes, there is a transfer of mass but negligible.