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Surface Tension

A disc of pap...

Question

A disc of paper of radius r is floating on the surface of water of surface tension T. Then force of surface tension on the disc is:

A

T . π r

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B

T .2 π r

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C

T .4 π r

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D

\frac{T}{2 π r}

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Solution

The correct option is C $T .2 π r$
Surface tensions acts along the boundary.
Force $= T . (2 π r)$

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