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Properties of Matter question

2024 · Q182
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Properties of Matter question

2024 · Q182

NEETPhysicsProperties of MatterMCQ+4 / −1

A thin flat circular disc of radius 4.5 cm4.5 \mathrm{~cm}4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N m−10.07 \mathrm{~N} \mathrm{~m}^{-1}0.07 N m−1, then the excess force required to take it away from the surface is

  1. A
    19.8 mN
  2. B
    198 N
  3. C
    1.98 mN
  4. D
    99 N
View written solutionFree

Correct answer: A

NEET 2024 Physics - Properties of Matter Question 3 English Explanation

$$ \begin{aligned} \& \text { Excess force }=T \times 2 \pi R \\ \& =\frac{7}{100} \times 2 \times 3.14 \times \frac{4.5}{100} \\ \& =197.82 \times 10^{-4} \\ \& =19.8 \times 10^{-3} \mathrm{~N} \\ \& =19.8 \mathrm{~mN} \end{aligned} $$

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