Case: Read the passage and answer the following questions

Historically the credit for the discovery of the fact that amber rubbed with wool or silk cloth attracts light objects goes to Thales of Miletus, Greece, around 600 BC. The name electricity is coined from the Greek word ‘electron’ meaning amber. Many such pairs of materials were known which on rubbing could attract light objects like straw, pith balls and bits of paper. For example, cut out long thin strips of white paper and lightly iron them. Take them near a TV screen or computer monitor. We can see that the strips get attracted to the screen. In fact, they remain stuck to the screen for a while.

What happens when a plastic rod & a glass rod rubbed with wool are brought close to each other?

Attract each other.

When a plastic rod is rubbed with wool the rod gains a negative charge and wool gains a positive charge, so they attract each other when brought together.