1.

Two soap bubbles of radii  \[{{r}_{1}}\] and \[{{r}_{2}}\] equal to 4 cm and 5 cm are touching each other over a common surface \[{{S}_{1}}{{S}_{2}}\] (shown in figure). Its radius will be                              [MP PMT 2002]

A. 4 cm   
B.             20 cm
C.             5 cm   
D.             4.5 cm
Answer» C.             5 cm   


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