Concept of a Magnetic Field (CIE A Level Physics)

Two bar magnets, A and B, are placed next to each other as shown in Fig. 1.1.

Fig. 1.1

Magnet A is slowly moved towards magnet B. This causes magnet B to move away from magnet A.

On Fig. 1.1, label the magnetic poles and sketch the magnetic field around the two magnets.

Magnet A and magnet B are now reorientated and when brought close together come together easily. 

On Fig. 1.2, label the magnetic poles and sketch the magnetic field around the two magnets.

Fig. 1.2

Magnet A is swapped for a magnet which is twice as strong but keeps the same orientation.

Describe how the magnetic field around magnet B would change. 

Fig. 1.1 shows a magnet held close to a second magnet which is suspended by a light cotton thread.

Fig. 1.1

Describe how a magnetic field is produced around a bar magnet.

Sketch the magnetic field lines around the magnets on Fig. 1.1. 

The first magnet is removed leaving only the magnet suspended from the string. As a result, the magnet rotates, so that the north pole faces into the page. 

Fig. 1.2

On Fig. 1.2, indicate whether the magnetic field is directed into or out of the page using the correct symbol.

Describe what is meant by a magnetic field.

State and explain whether

Two magnets are placed on top of each other as shown in Fig 1.1

Fig. 1.1

On Fig. 1.1, sketch the magnetic field lines between the two magnets

On Fig. 1.1, indicate a point in the strongest region of the magnetic field. Explain your answer.