Magnetic field (B)
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.