Consider a water tank shown in the figure. It has one wall at x=L and can be taken to be very wide in the z direction. When filled with a liquid of surface tension S and density , the liquid surface makes angle 0 ( 0 1 ) with the x-axis at x=L . If y(x) is the height of the surface then the equation for y(x) is: (take (x)= (x)= (x)= dy dx ; g is the acceleration due to gravity)

1. A. dy dx = g S x
2. B. d 2y dx 2 = g S x
3. C. d 2y dx 2 = g S y
4. D. d 2y dx 2 = g S

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