Magnetism

This task is about magnetic fields.

Question

a)  A steel knitting needle is magnetised by stroking it 50 times in one direction with the north pole of a powerful bar magnet until it becomes magnetised.
     What happens when this knitting needle is cut in half?

    • It becomes two magnets, each has a north and south pole. 

    • It becomes two magnets, one has a south pole but no north pole; and the other has a north pole but no south pole. 

    • It becomes two magnets, one has a strong south pole and a weak north pole; and one has a strong north pole and a weak south pole. 

    • It loses its magnetism once it has been cut into two pieces.

Question Change answer

b) Draw on the diagram below:
  1. The lines of the magnetic field that would occur around and between the two magnets when they are pushed together.
  2. The direction the field flows in.