17. The surface tension of a soap solution
is 2 x 10-2 N/m. To blow a bubble of radius 1 cm, the work done is
(a) 4 π x 10-6 J
(b) 8 π x 10-6 J
(c) 12 π x 10-6 J
d) 16 π x 10-6 J
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a