Work done in increasing the size of a soap bubble from a ra…

Physics Surface Tension JEE (Main) / AIEEE Problems (Previous Years) MCQ (Single Correct)

Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly. (Surface tension of soap solution = 0.03 Nm –1 )

4 π mJ

0.2 π mJ

2 π mJ

0.4 π mJ

Text Solution

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The correct answer is:

W = T A

= 0.03 (2 × 4 π × (5 2 – 3 2 ) 10 –4 = 24 π (16) × 10 –6

= 0.384 π × 10 –3 Joule 0.4 π mJ

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