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8. 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

Ans. d

(7)

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