M. 282. By means of a compass measure the magnetic induction of a bar magnet as a function of the distance r measured from the centre of the magnet. The measurements should be carried out along two lines:
a) the longitudinal axis of the bar magnet;
b) perpendicularly to the longitudinal axis.
You may use that the horizontal component of the magnetic induction of the Earth is 2.10-5 T.
Deadline expired on 11 December 2007.