First slide

Surface tension

Question

A slider PQ is kept on the parallel arms of a U-shaped wire frame as shown in figure. A soap film is formed in the space enclosed by the slider and U-shaped wire frame and the slider is held in position by an external agent. The film is horizontal. Now the slider is displaced to the right along the parallel arms and released. Then after release

Moderate

A

The slider PQ will return to its original position and stop
B

The slider will perform oscillatory motion about its mean position
C

The slider will be in equilibrium in its displaced position
D

The slider will move to the left and finallyl strike the arm AB.

Solution

After the slider is released, the horizontal surface tension force $2 \times Tl$ (l = separation between horizontal arms) is the only unbalanced force acting on the slider. Hence the slider will accelerate to the left and ultimately strike the arm AB.

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