24. Two soap bubbles of radii
r1 and r2 equal to 4 cm and 5 cm are touching each other over a common surface s1s2 (shown in figure). Its radius will be
(a) 4 cm
(b) 20 cm
(c) 5 cm
(d) 4.5 cm
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a