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Question

The rise of liquid into capillary tube is h1. If the apparatus is taken in a lift moving up with acceleration, the height is h2, then:

A
h1=h2
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B
h1>h2
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C
h2>h1
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D
h2=0
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Solution

The correct option is C h1>h2
If lift is moving up than with accln a effective accln due to gravity becomes (g+a)
h1=2Tcosθrρg
h2=2Tcosθrρ(g+a)
h2<h1

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