hello sir, i have a doubt about how the materials gain a perticular charge, i mean for example when a - Physics - Electric Charges And Fields

Question

hello sir, i have a doubt about how the materials gain a
perticular charge, i mean for example when a glass rod is rubbed
with silk cloth, why does the glass rod gains positive charge
only?? why cant it gain negative charge or why does the silk cloth
gains negative charge only? why cant it gain a positive
charge??

Aditi · Accepted Answer

When a body is touched with an other, a weak chemical bond is
formed between them, now when we slide them across each other, the
electrons engaged in bond formation transfer from one body to the
other Some bodies prefer to keep the electrons some give away
depending on their molecular structure Glass rod when rubbed with
silk prefers to give away the electrons to the silk and becomes
positively charged Negative charges are developed in silk as
electrons flow into it This is true for any pair of objects
that are rubbed to be electrified