28 



ON MAGNETISM. 



It is important to observe here that the negative 

 power of c is greater than in the expression found in 

 Article 14. The force which would produce the first or 

 principal term in the expression for angular momentum 

 is 4a/3 x a x c"" 1 " 1 . The proportion of the force of trans- 



lation now found to that force is - . 



c 



If then c be much 



larger than b, the force tending to produce translation 

 is much smaller than the force producing angular mo- 

 mentum. 



16. The disturbing magnet is end- on towards the 

 center of the disturbed magnet, which is broadside-on : 

 to find the angular momentum impressed. 



Fig. 10. 



The notation for Figure 10 being the same as for 



