288 Mr. R. H. M. Bosanquet on Self-regulating 



where v 



n+ -r 



F= P-. 



R + rs 



Magnetic field = 23. 



= \(FE) y . 



Equation of E.M.F. developed. 



E=3W. 



v= velocity of conductor of armature at right angles io 



lines of force, 

 1= effective length of conductor; 



.-. E =l\v{¥E)\ 

 E l ~ y = l\vW, 



E =(l\v)^ y F^ y . 



Put ,1,11 



7=1 •> 1—7= ? i = #3 



' x ' x 1— y 



ft = (l\v) x F*-\ (I.) 



r here , v 



R + rs p 



For main circuit only. p = co , v=0 ? 5 = 1. 



R + r 



For shunt circuit only, w = 0. 



p R + rs 



- determines the wire of the shunt. It is the number of 

 p 



turns that has a resistance of 1 ohm. Otherwise, - is the 



7 v 



resistance of one turn of the shunt coil. 



