() Electricity is a form of energy. It is used in different purposes as
described in the previous chapter.
2 There are two types of electrilty namely STATIC RICITY and

() Take a plastic ruler and rub it with a piece of silk for some time. Now
bring the ruler near some small pieces of paper.
a) You will see that pieces of paper are attracted to the ruler, this is
because the ruler is electrically charged.
(3) Similarly take a plastic comb and comb your dry hair quickly a number
of times. Now hold the comb near your hair and observe in a mirror.

4) You will see that your hair are attracted towards the comb. This is

because the comb is electrically charged.
5) We conclude from the above experiments that electricity can be

produced by rubbing rods made of different materials such as glass.
. plastic and ebonite with a piece of silk and wool respectively.
6) The charge produces in this way is called static electricity. Static means

“at rest” or “not moving”.
7) In static electricity the electrons do not move and the charge normally
at rest

( ) Take two glass rods. Rub each of them with a piece of silk. Suspend

one of them by a thread so that it can move freely in air.
(2) Now bring other rod near it. The suspended rod is pushed away as

shown in figure.
(3) As the two glass rods have been rubbed with same material, similar

charges have been produced on both rods.
(4) Similar charges have been indicated on-tw rods by writing plus sign (
(5) Thus it can be said the similar charges or like charges repel each other.

1) All material things are made up of very tiny particles called atoms. Atoms

are the building block of matter. There are three basic particles of an atom.
Proton, Neutron and Electron.

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