QJEEM11Ph5fb2: JEE Main 2011 Physics - Class 11 JEEM11Ph5fb2 Solution: Work done in increasing the size of a soap bubble from a radius …

Question

Verified Solution • 2025–26 Session moderate

Work done in increasing the size of a soap bubble from a radius of

3

c m

to

5

c m

is nearly (Surface tension of soap solution

= 0.03 N m^{- 1},

Accepted Answer

W = T \times

change in surface area

W = 2 T 4 π [{(5)}^{2} - {(3)}^{2}] \times 10^{- 4}

= 2 \times 0.03 \times 4 π [25 - 9] \times 10^{- 4} J

= 0.4 π \times 10^{- 3} J

= 0.4 π m J

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