PHYSICS [1 Mark Question Answer]

Materials that do not allow electricity to pass through them are called insulators. Insulators oppose electric current and so they are used as a protection from the dangerous effects of electricity. Examples of insulators are glass, air, wood, plastic and rubber.

Due to excess electrons in the rod

electrons move from silk to glass rod

The charges present on the ebonite rod and the cat’s skin on rubbing with each other the cat’s skin becomes positively charged.

The glass rod has a deficiency of electrons and acquired a positive charge while the silk cloth acquires a negative charge.

A substance with more number of free electrons is said to be good conductor.

Unlike charges attract each other.

When the silk is rubbed with glass, the silk gets negatively charged.

Negative electrification is due to the excess of electrons.

Glass wool is a poor conductor of electricity.