DISTURBING MAGNET BROADSIDE-ON. 



25 



momentum which A produces on B. The continuous 

 ^S m 9< lines denote attraction ; the inter- 



rupted lines denote repulsion. Let 

 2a and 26 be the lengths of the two 

 magnets as measured from pole to 

 pole : a and /3 the magnetic energies 

 at the poles (meaning by this that 

 the attraction or repulsion will be 

 expressed by a/3 x (distance )~ m ) ; c 

 the distance between the centers of 

 the magnets, which is supposed to 

 be considerably greater than a or 

 6. Then the distance from the 

 blue pole of A to the red pole of 

 B is 



the attractive force is 



the resolved part of this, drawing the red pole of B to 

 the right, is 



a similar term is obtained from the repulsion of the red 

 pole of A on the red pole of B : and the whole angular 

 momentum which they impress on B is 



