Question

why the glass rod gets positively charged on rubbing with silk???​

Answer 1

by rubbing their will be produced electrostatic charge

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Answer 2

$Heya\:$

◆ When you are rubbing the glass rod with the silk cloth, electrons are stripped away from the atoms in the glass and transferred to the silk cloth.

This leaves the glass rod with more positive than negative charge, so you get a net positive charge.