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Question

Water rises to a height h in a capillary on the surface of the earth in stationary condition. Value of h increases, g decreases then :

A
On poles
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B
On sun
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C
In a lift going upward with acceleration
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D
In a lift going downward with acceleration
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Solution

The correct option is D In a lift going downward with acceleration
We have, h=2Tcosθrdg
h1g
When lift moves downwards, then effective value of g decreases, (g-a), hence h increases.

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