Question 18
FA student uses a plotting compass to draw the magnetic field around a bar magnet.
The Figure shows the student's sheet of paper part of the way through the experiment.
Figure
a.[4]
Describe how the student can use the plotting compass to draw one complete field line from the north pole to the south pole of the magnet.
b.[1]
State how the student should show the direction of the magnetic field on the field line.
c.[2]
The student then places the plotting compass on the bench, a long way from the magnet.
The north-seeking end of the needle points north.
Explain why.
d.[1]
The field lines that the student draws close to the magnet are smooth curves.
Further from the magnet, the dots no longer follow the expected pattern.
Suggest why.