Question

A student rubbed a plastic rod with a doth

The rod became negatively charged and the cloth became positively charged

explain why the cloth became positively charged

Answer 1

When different insulating materials rub against each other, they can become electrically charged. When the cloth is rubbed against the rod, the friction causes electrons to gain energy, transferring themselves to the rod and therefore becoming posively charged. The rod is now negatively charged as it has gained electrons.