566 



ELECTRICAL INDUCTION. 



electricity of the neutral body which is of the opposite 

 kind, and repels that which is of the same kind. If the 

 neutral body is a conductor, the electricities move easily 

 in obedience to the attractive and repulsive forces 

 which come into play. The electricity of the same 



kind as that of the induc- 

 ing body moves to the 

 more remote part of the 

 neutral body, while the 

 opposite electricity moves 

 to the nearest part. Thus, 

 let fig. 305 A represent 

 the electrical state of the 

 two discs before the 

 glass rod is brought near 

 them. If the positively 

 glass rod is 

 near from the 

 right side the negative electricity of the discs is at- 

 tracted by it and moves towards the disc on the right 

 side, while the positive electricity is repelled towards 

 the left disc ; this is shown at B. If the glass rod is 

 removed while the discs are in contact, the neutral 

 state represented at A is again restored, and both 

 metallic discs are unelectric, but if they are separated 

 while the glass rod is still in their neighbourhood, as 

 indicated at (7, a union of the two electricities cannot 

 take place after the glass rod is removed, and on test- 

 ing the discs they are found to be charged with opposite 

 electricities; finally, if brought into contact after re- 

 moval of the glass rod, the original neutral state of the 

 discs is again restored. 



FIG. 305. 



charged 

 brought 



