1.

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.             \[{{r}_{2}}+{{r}_{1}}\]
Answer» D.             \[{{r}_{2}}+{{r}_{1}}\]


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