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Q.

A square wire frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, the force acting on the frame will be

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a

2TL

b

4TL

c

8 TL

d

10TL

answer is C.

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Detailed Solution

Ftotal =T× total circumference  =T×2×4L Ftotal =8TL
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