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Surface Tension

There is a ho...

Question

There is a horizontal film of soap solution On it a thread is placed in the form of a loop The film is punctured inside the loop and the thread becomes a circular loop of radius R If the surface tension of the soap solution be T then the tension in the thread will be

A

π R^{2} / T

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B

π R^{2} T

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C

2 π R T

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D

2RT

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Solution

The correct option is B 2RT
F=TL
F=force( in this case , tension force)
T=surface tension constant
L=length of the wire i.e. diametre of the sphere
F=T(2R)
F=2RT

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