ELECTROMOTIVE FOHCE AND CURRENT, 



motive force generated in the conductor P will be zero at 

 the moment when the conductor moves horizontally at the 

 top and bottom of its path, since in this position it moves 

 along and not across the lines. The maximum rate of cutting 

 lines occurs when the conductor moves vertically, i.e., per- 

 pendicularly to the lines. Any movement horizontally or 

 parallel with the lines has no effect in producing electro- 

 motive force, whereas the vertical velocity determines the 



VARIATION IN E.M.F. INDUCED IN ROTATING CONDUCTOR 



Vh 



FIG. 3. 



amount of electromotive force generated. It therefore 

 becomes important to consider separately the vertical velocity 

 of the conductor, since this is the factor affecting the voltage 

 generated. 



Now a velocity, when represented graphically in magnitude 

 and direction by a straight line, may be resolved into two 

 components in any direction represented by the sides of a 

 parallelogram of which the line representing the velocity 

 forms the diagonal. Thus if P (Fig. 3) represents to scale 

 the velocity of the conductor, N P and O N will represent 

 to the same scale the horizontal and vertical velocities of the 

 conductor when travelling in the direction P. 



Thus the sides of the triangle P N represent to the same 

 scale the velocity of the conductor P and its vertical and 

 horizontal components respectively, 



P representing the actual velocity, 

 N representing the vertical velocity. 

 AT P representing the horizontal velocity. 



Now the triangle P N in Fig. 2 is similar to the triangle 

 similarly lettered in Fig. 3, but is turned through a right angle. 

 Thus, if in Fig. 2 the line O Pis taken to represent in magnitude 



