The interesting question
is how the magnet attracts the paper clip? From the above activity we notice
that magnets have an invisible field all around them which attracts magnetic
materials. In this space we can feel the force of attraction or repulsion due
to the magnet. us, magnetic field is the region around the magnet where its
magnetic in uence can be felt. It is denoted by B and its unit is Tesla.
The direction of the
magnetic field around a magnet can be found by placing a small compass in the
magnetic field as shown in the Fig 3.3
Magnetic field can
penetrate through all kinds of materials, not just air. The Earth produces its
own magnetic field, which shields the earth's ozone layer from the solar wind
and is important in navigation using a compass.