ELEMENTARY THEORY OF MAGNETISM. 



4. The two magnets specified in problem I are arranged as 

 shown in Fig. p\. Find the total force with which one magnet 

 acts on the other. Ans. 507.8 dynes attraction. 



\20 



cm 



N 



Fig. p4. 



5. A magnet I .o by 0.25 by 40 centimeters long, having 800 units 

 pole per square centimeter of sectional area, is laid across one of 

 the magnets specified in problem I, as shown in Fig. p$. Find 



\ 



S 



Fig. pS. 



the total force with which one magnet acts oh the other. Ans. 

 5,376 dyne-centimeters of torque tending to turn magnets as 

 shown by arrows in Fig. p$. 



1 



t 



rW 



N 



"SOTr*. 



Fig. p6. 



6. The two magnets specified in problem I are hung from a 

 balance beam as indicated in Fig. p6. Assuming that the 



