[ 599 1 
be repelled with as much force by the neareft plate, 
as by the more diflant ; and confequently, will be 
impelled with the fame force by either plate, at 
•whatever dillance from it it be placed. 
Corollary. 
If the repiihion of the particles is inverfely as fome 
higher power of the dillance than the fquare, the 
plate will repel a particle with more force, if its 
diflance be fmall than if It be greats and if the re- 
pulfion is inverfely as fome lower power than the 
fquare, it will repel a particle with lefs force, if its 
diftance be fmall than if it be great. 
PROP. VII. 
Prob. 3. In fig. 4. let the parallel lines Ka\ 
&c. reprefent parallel planes infinitely, ex- 
tended each way let the fpaces ^ A D and 
E H be filled with uniform folid matter : let 
tlie eledlric fluid in each of thofe fpaces be 
moveable and unable to efcape : and let all the 
reft of the matter in the univerfe be faturated 
with immoveable fluid j and let the eledric at- 
traction and repulfion be inverfely as the fquare 
of the diftance. It is required to determine in. 
what manner the fluid will be difpofed in the 
fpaces AD and EH, according as one or both, 
of them are over or undercharged. 
'■* By the fpace AD or AB, He. I mean the fpace compre- 
hended between the planes A« and D d, or between A a and 
Let 
