335 



As the resistance of every circuit amounts to »i.lF, we get for 

 the integral current, which tlows through the linear part of the 

 tirst conductor: 



di. dM] „ 



c m. vv^ „, „ Oi2,^ 

 For this may also be written : 



dL dMi „ 



c.m.n. W^ „ „ Öi2,q 

 In the same way the integral current 



'^'^' — nz ^ ^ ~^- — 



c m.n. W„ „, „ oi\_p 



flows through the linear |)art of the second conductor on a change 

 (//, of the current in the first conductor. 

 If 



dl, = dl„ 

 then follows, when (2) is used : 



W^ .de,= \V,.de, (15') 



In general : 



de, d<;, 



"'ör.= "-sr, ('^> 



in which the meaning of the differential quotients is analagous to 

 that which was attached to them above in (3j. 



This relation is analagous to (3). It holds quite generally, so long 

 as 5^ is a univalent function of C. which, however, can be quite 

 arbitrary for the rest. 



If the permeability is independent of the strength of the field, 

 so that there exists a linear relation between "'S and .f>, we shall 

 be able to integrate equation (15). So we get: 



ir. .., =z W^.e, (16) 



analogous to relation (7). Here just as there t?, resp. c, will mean 

 the integral currents which flow through the linear part of the first 

 resp. second conductor, when the current in the second resp. first 

 conductor increases from zero to the same value I, the other con- 

 ductor being without current. 



5. Just as we did before in the case of two circuits we can also 



