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Application

• Structure of the compass:

A magnetic needle (light and small) that can spin freely
around a fixed axis and is placed in a copper / plastic box.
To prevent the attraction between the needle and the box which can

affect its movement.
1- The North Pole of the magnetic needle refers to the north direction

of the Earth.
2- The South Pole refers to the south direction of the Earth.

• Importance of the compass:

Old tool to determine the four main geographical directions.

(E – W – N – S)

Law of attraction and repulsion

The similar (like) magnetic poles repel each other, but the
different (unlike) magnetic poles attract to each other.

North repels north & North attracts to south

? The magnet can exert pulling or pushing force.

First Term 127