12. If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is
(a) W/2
(b) 2W
(c) 4W
(d) (7/3) W
Ans. c
(33)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)