Which of the following are transferred from one object to another when these two objects are charged by friction?

Which of the following cannot be charged by friction, if held by hand?

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

The electric nature of lightning was established by a scientist named:

A plastic comb is rubbed with dry hair whereas a glass rod is rubbed with a piece of silk cloth. Which of these will get negatively charged?

A) Plastic comb

B) Glass rod

C) Dry hair

D) Silk cloth