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Q.

A disc of paper of radius R has a hole of radius r. It is floating on a liquid of surface tension T. The force of surface tension of the disc is

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a

T×2πR

b

T×2π(R−r)

c

T×2π(R+r)

d

T×4π(R+r)

answer is C.

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Detailed Solution

Since water has single free surface total length ofboundary = (2πR+2πr)Magnitude of total surface tension force=(2πR+2πr)×T⇒2π(R+r)T
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