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Question

Surface tension of water is0.072N/m. The excess pressure inside a water drop of a diameter 1.2mm is:


A

240N/m2

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B

24N/m2

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C

0.06N/m2

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D

60N/m2

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Solution

The correct option is B

24N/m2


Explanation for correct option

Step 1. Given data

  1. Surface tensionS of water is 0.072N/m
  2. Diameter of water dropD=1.2mm=0.012m

Step 2. Formula used

  1. Radiusr=D2
  2. P=2Sr

Where r is the radius , D is the diameter, S is the surface tension, P is the exerted pressure

Step 3. Find the exerted pressure inside the water drop

S=0.072N/m

r=0.0122=0.006m

P=2Sr=2×0.0720.006=24N/m2

Hence, Option B is correct


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