10. The radius of a soap bubble is increased
from (1/√π) cm to (2/√π) cm. If the surface tension of water is 30 dynes per cm, then the work done will be
(a) 180 ergs
(b) 360 ergs
(c) 720 ergs
(d) 960 ergs
Ans. c
(12)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)