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Q.

A circular wire frame of radius R is dipped in a soap solution of surface tension σ. When it is taken out a thin soap film is formed inside the frame. The force on the frame will be

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a

8πσR

b

πσR

c

4πσR

d

2πσR

answer is C.

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Detailed Solution

Total length of wire is L = 2πR. Since the film is in air, force on frame = 2σ x L = 2σ×2πR=4πσR. 

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