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How is the rise of liquid affected if the top of the capillary is closed?
How is the rise of liquid affected if the top of the capillary is closed?
Physics | Previous Year Question Papers
How is the rise of liquid affected if the top of the capillary is closed?

If the top of the capillary tube is closed, there will be a little rise in the capillary tube. Because the downward force exerted by compressed air above the liquid in the tube opposes the rise of liquid in the capillary tube owing to surface tension. As the height of the liquid column rises, the downward force increases. In a capillary tube with a closed top, only a tiny rise of the liquid column is feasible

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At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be $0.16 \mathrm{G} .$ Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be $0.16 \mathrm{G} .$ Specify the direction and magnitude of the earth’s field at the location.