[ 620 J 
puUion when the matter is fpread uniformly, as 
3 — «xAC^ 
X — , to 
AC"-^ DA"-‘ ^ 
D As^«. 
Coroll. I.. 
If the length of * the column is fo great, that 
AC'^* is very fmall in refpedt of DC”~*, the re- 
pulfion of the plate, when all the matter is collected 
fn the circumference, is to its repuUion when the 
matter is fpread uniformly, very nearly as ^ - — 
to AC or as 3 — « to 2.. 
CoROLL, ir. 
If E C Is very fmall ,in refpefl of AC the- 
rcpulfion of the plate on the Ihort column E C, when 
all the matter in the plate is colledled in its circum- 
ference, is to its repulfion when the matter is fpread- 
3 »X« ixEC^ 
uniformly, very nearly as toE C^' 
4AC 
or as 3 — — I xE C”~* to 4' AC"— * and is 
therefore very fmall in comparifon of what it is when, 
the matter is fpread uniformly^ 
For by the fame kind of procefs as was ufed in. 
Lemma 8, it appears, that if E C* is very fmall in 
refpea of AC\AC^x 
AC 
— ? — differs very 
' EA"~* 
little- 
