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(B) The surface tension force $F$ acting on a body is given by the formula $F = T 	imes L$,where $T$ is the surface tension and $L$ is the total leng

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$2 \pi T(R+r)$

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(B) The surface tension force $F$ acting on a body is given by the formula $F = T 	imes L$,where $T$ is the surface tension and $L$ is the total length of the boundary in contact with the liquid.For a disc of radius $R$ with a hole of radius $r$ floating on a liquid,the liquid is in contact with both the outer circumference and the inner circumference of the hole.The outer circumference is $L_1 = 2 \pi R$.The inner circumference is $L_2 = 2 \pi r$.The total length of the boundary in contact with the liquid is $L = L_1 + L_2 = 2 \pi R + 2 \pi r = 2 \pi (R + r)$.Therefore,the total force of surface tension is $F = T 	imes 2 \pi (R + r) = 2 \pi T (R + r)$.

$A$ 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 on the disc is

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