214 Mr Bevan, A Lecture Experiment, etc. 



The moment of the force on the South pole is similarly 



J^ or equilibrium yy^. = -^a > 



so that i^P and $Q meet on (Li. 



The centre of the circle ONS is therefore on the line OA, and 

 for this to be possible OA must be greater or less than both AN 

 and AS. There is therefore no equilibrium position with the 

 magnet arranged as in the experiment. 



