﻿1032 Equations of Balanced Alternating- Current Brl 



no current can flow from the primary into the secondary 

 circuit by conduction, since the two circuits have onlv one 

 point in common. The secondary current is produced only 

 by induction, and the two circuits may just as well be entirely 

 separate. In this manner fig. 2 is obtained from fig. 4. 



Fior. 3. 



<2 A 2 *4 



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Fio-. 4. 



Galvanometer 







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This also explains the reason tor which Z 2 and Z 4 in the table 

 are marked equal to zero. Thus, the fundamental formula 

 (D) is also applicable to bridges in which the secondary 

 current is produced entirely by mutual induction, and the 

 primary source of current has no metallic connexion with 

 the bridge itself. 



