A film of soap solution is made in rectangular frame of length 10 cm and breadth 4 cm. the force of surface tension on the smaller edge of the frame is .......... dyne. (Surface tension of soap solution = 30 dyne/cm)
(A) 60
(B) 120
(C) 300
(D) 240
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Answer: Answer is D
Explanation: force due to surface tension is= (surface tension) (length on which it's acting) = force
30*(2*4) = 240 dyne.
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