JEE Mains · Physics · STD 11 - 9.2 surface tension
A soap bubble of surface tension \(0.04 N / m\) is blown to a diameter of 7 cm . If \((15000- x ) \mu J\) of work is done in blowing it further to make its diameter 14 cm , then the value of x is _________ .\((\pi=22 / 7)\)
- A 11304
- B 3696
- C 12000
- D 15000
Answer & Solution
Correct Answer
(A) 11304
Step-by-step Solution
Detailed explanation
\(W =\Delta u\) \(= S \times\left(8 \pi r_2^2-8 \pi r_1^2\right)\) \(=0.04 \times 2 \times \frac{22}{7}(147) \times 10^{-4}\) \(W =3696 \times 10^{-6} J\) \(3696=15000-x\) \(x =11304 \mu J\)
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