cannot be larger than because the surface has to be curved inwards.
Figure 2.19. The solution
For , the possible solutions are
Table 2.2.
0.01
0.053
0.1
0.299
0.5
0.658
0.5524
0.6627
0.7
0.627
0.8
0.555
0.999
0.045
A point to note at this juncture is that there is no solution for . Physically, this means that if the two loops are located far away from each other no film will be formed. From the table we can see that in this case
is small, i.e.
because the surface has to be curved inwards.
, the possible solutions are
. Physically, this means that if the two loops are located far away from each other no film will be formed. From the table we can see that in this case 
