If a capillary is dipped partially in water contained in a beaker which is placed inside a lift falling freely then the water:
A
will rise upto the upper end of the capillary
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B
will rise upto a certain height only
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C
will not rise at all
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D
will oscillate in the capillary
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Solution
The correct option is A will rise upto the upper end of the capillary Height of liquid in capillary is h=2Tcosθrρg
If the mass of the risen water is m and the lift is freely falling, then the lift is a non-inertial frame of reference where a pseudo force will act in a direction opposite of the acceleration of the frame.
the lift is accelerating with g so the pseudo acceleration is g upwards. So resultant value of g is zero.
So theoretically the rise is infinite.
Practically, no matter how tall the tube is, water will come out of it from the upper end as a fountain.