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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 24

  • question_answer
    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 \[{{S}_{1}}{{S}_{2}}\] (show in figure). Its radius will be

    A) 4 cm    

    B)        20 cm

    C) 5 cm    

    D)        4.5 cm

    Correct Answer: B

    Solution :

    \[r=\frac{{{r}_{1}}{{r}_{2}}}{{{r}_{1}}-{{r}_{2}}}=\frac{5\times 4}{5-4}=20\,cm\]


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