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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    The force due to surface tension of a capillary tube filled with water is balanced by the force of \[72\times {{10}^{-5}}\]N worked toward the base due to weight of water. The surface tension of water is 0.06 N/m. The internal radius of capillary tube will be will be

    A)  0.5 mm            

    B)  2 mm

    C)  1.1 mm            

    D)  1.75 mm

    Correct Answer: B

    Solution :

     According to question \[mg=2\pi rT\] \[\Rightarrow \] \[r=\frac{mg}{2\pi T}\] \[=\frac{72\times {{10}^{-6}}}{2\times 3.14\times 0.06}\] \[=2\text{ }mm\]


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