DISTURBING MAGNET END-ON. 29 



Figure 9, it will be seen that the resolved part of the 

 force which the red pole of A impresses on the red pole 

 of B tending to turn it against watch-hands is 



-m-l 



a/3x (c-a)x (c 2 - 2ca + a 2 + 6 2 ) 2 , 



-m-l 



which produces the angular momentum 



-m-l 



o 7 /-, o\ /- 2a a? + V\ 2 



o.B x b . c~ m x [ 1 -- x 1 -- + 2 

 \ cj \ c c 2 / 



A similar term is produced by the attraction of the red 

 pole of A on the blue pole of B : thus the whole angular 

 momentum opposite watch-hands produced by the red 

 pole of A is 



-m-l 



2 



The momentum produced by the blue pole of A is found 

 in like manner to be 



and therefore the entire momentum opposite watch 

 hands is 



