3. The surface tension of soap solution is
25 x 10-3 Nm-1 . The excess pressure inside a soap bubble of diameter 1 cm is
(a) 10 Pa
(b) 20 Pa
(c) 5 Pa
(d) None of the above
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a