a) Define magnetic field lines. Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole. b) Explain why a freely suspended magnet always points in the north-south direction.

1. There will be a movement in the magnetic field lines when the north magnetic pole is The magnetic field lines are also known as magnetic lines of force.

Activity:

Take a small compass and a bar magnet.

Place the bar magnet on a fixed placed on the drawing board using a adhesive material. The boundary of the magnet should be marked.

The compass should be placed near the north pole of the magnet. The south pole of the needle points towards the north pole of the magnet.

Mark the ends of the needle.

By moving the needle, we can see that the north pole is occupied by the south pole of the needle. By joining the points marked, a smooth curve is obtained.

1. A freely suspended magnet points towards the north-south direction because the earth behave as a magnet with its south pole in the geographical north and the north pole in its geographical south.