The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T= surface tension of the solution)

(a) 4π(D2-d2)T                     (b) 8π(D2-d2)T

(c) π(D2-d2)T                        (d) 2π(D2-d2)T

(d) 

W=T×8π(r22-r12)=T×8πD24-d24=2π(D2-d2)T

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