question_answer

When two soap bubbles of radius \[{{r}_{1}}\]and \[{{r}_{2}}\] \[({{r}_{2}}>{{r}_{1}})\] coalesce, the radius of curvature of common surface is [MP PMT 1996]

A)             \[{{r}_{2}}-{{r}_{1}}\]       

B)             \[\frac{{{r}_{2}}-{{r}_{1}}}{{{r}_{1}}{{r}_{2}}}\]

C)             \[\frac{{{r}_{1}}{{r}_{2}}}{{{r}_{2}}-{{r}_{1}}}\]     

D)             \[{{r}_{2}}+{{r}_{1}}\]