A 20cm long capillary tube is dipped in water. The water rises up to 8cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be _____cm.

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answer is 20.

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Detailed Solution

On freely falling elevator, the gravitational force on water will be zero therefore, surface tension will not be cancelled by any other force and, hence, water will be raised to full length of capillary tube.

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