Question

what happens when flannel is rubbed over a glass rod

Answer 1

when a glass is rubbed with funnel induces charge

Answer 2

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. The tiny electrons, however, can move around much better. That's why the glass rod can induce a net negative charge at one end of the paper clips.