Question

When a glass rod is rubbed with a piece of silk cloth, then: 

A. the glass rod and silk cloth both acquire positive charge. 

B. the glass rod becomes positively charged while the silk cloth has a negative charge. 

C. the glass rod and silk cloth both acquire negative charge. 

D. the glass rod becomes negatively charged while the silk cloth has a positive charge.

Answer 1

B. the glass rod becomes positively charged while the silk cloth has a negative charge. 

After rubbing the glass rod with silk cloth, the glass rod becomes positively charged. The silk cloth becomes negatively charged. The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object.