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Q.

Radius of a soap bubble is increased from R to 2R work done in this process in terms of surface tension is

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a

$24 {πrR}^{2} S$

b

$48 {πrR}^{2} S$

c

$12 {πrR}^{2} S$

d

$36 {πrR}^{2} S$

answer is A.

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Detailed Solution

$W = ΔE = 8 πT [(2 R)^{2} - R^{2}] = 24 {πR}^{2} T$

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