A wire forming a loop is dipped into soap solution and taken out so that a film of soap solution and taken out so that a film of soap solution is formed. A thread of length 6.28 cm is gently put on the film and film is pricked with a needle inside the loop. Find the tension in the thread if surface tension of soap solution is 0.03 Nm -1 .
Text Solution
Verified by ExpertsThe correct answer is:
C
2T sin θ θ = S 2r θ θ where S is surface tension and 2 r θ θ is length of thread AB.
Since θ θ is small
sin θ θ = θ θ
2T θ θ = S 2r θ θ
or T = Sr = .03 × 10 2 = 3 × 10 -4 N
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