DISTURBING MAGNET END-ON. 31 



and the entire angular momentum opposite watch- 

 hands is 



or 



x ab x 



L . c + ^^ . c-f^ '- 6=)l . 

 I * \ 6 J) 



On comparing this result with that of Article 14, it 

 will be seen that the first or principal term here has the 

 factor m, while that in Article 14 has the factor 1. 



17. In the same arrangement, to find the tendency 

 of the action of A to produce a motion of translation of B. 



Here also it is seen that there is no tendency to carry 

 B to or from A 9 but there is a tendency to carry it to 

 the right. Both actions of the red pole of A tend to 

 carry B to the right, and both actions of the blue pole 

 of A tend to carry B to the left. The result is the 

 same as that of Article 15, of which the circumstances 

 are exactly reversed in this problem. 



18. To find the tendency of the action of A upon B 

 in the simplest cases of parallelism of the two magnets. 



The cases to be considered are those represented in 

 Figures 11, 12, 13, 14. In all these, there is no tendency 

 to produce angular motion, or to produce motion of 

 translation to the right or left. But there is tendency 

 to produce motion of B to or from A, The student will 

 easily verify the following results. 



