Q.2 When a glass rod is rubbed with a piece of silk cloth the rod
(a) and the cloth both acquire a positive charge.
(b) becomes positively charged while the cloth has a negative charge.
(c) and the cloth both acquire a negative charge.
(d) becomes negatively charged while the cloth has a positive charge

When a glass rod is rubbed with a piece of silk cloth, the rod
(b) becomes positively charged while the cloth has a negative charge.

EXPLANATION

This happens because when a glass rod is rubbed with a piece of silk cloth, then the glass rod loses some electrons and become positively charged while the silk cloth gains those extra electrons and becomes negatively charged.