Question

Two soap bubble of radii a and b combine to form a single drop of radius



c.If p is external pressure then surface tension of soap solution is

Answer 1

p= 4T{1/a-1/b)=4T/c

hence this will be the excess pressure

this is the difference between pressure inside two bubbles earlier

from here you can find surface tension

Answer 2

The radius c= underroot of a^2+b^2. We know that p=4T/R( 4T as it's a soap bubble). The ans will be T=p* underroot of a^2+b^2 / 4