A thin wire AOB is bent at point O and kept in a vertical position. A soap film is formed between a slider PRSQ and the bent wire. Initially the slider PRSQ is in equilibrium in the position shown. Now the slider is slightly pulled downward and released. Then after release
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a
The slider will be in equilibrium in its despalced position
b
The slider will move upward and finally stop at point O
c
The slider will start moving upward and finally stop at its initial equilibrium position
d
The slider will make oscillatory notion about its initial equilibrium position
answer is D.
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Detailed Solution
At any instant of time after release, net vertically upward unbalanced force acting on the slider is Fnet=TR1S1−RS=T.x.tanθ2Since Fnet∝x and opposite to the displacement x from equilibrium position, subsequent motion of the slider will be simple harmonic.