Four metallic bars, suspended freely from a ceiling, interact, as shown in the diagram
below. The points of attachment of X and Y on the ceiling are 4 cm apart.
The two bars in the middle are bar magnets (X and Y) and the distance between them
is 5 cm. One of the bars (A or B) is made of iron and the other is made of gold.
9.1 Write down the term describing a material that is easily magnetised. (1)
9.2 Which ONE of the bars (A or B) is made of iron? (1)
9.3 Determine the polarity of bar B closest to bar magnet Y. Write only NORTH or
SOUTH. (1)
9.4 Explain the answer to QUESTION 9.3. (2)
9.5 Sketch the magnetic field pattern around bar magnet X. (3)
9.6 Bars A and B are now removed and the points of attachment are now 2 cm, as shown in the diagram below.
9.6.1 How will the change in the position of the attachment affect the final distance of separation between the bars? Write only GREATER THAN 5 cm, LESS THAN 5 cm or REMAINS at 5 cm. (1)
9.6.2 Explain the answer to QUESTION 9.6.1. (2)
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