While performing experiment to measure surface tension of water using capillary rise method, the necessary precautions to be taken is
(i) both capillary tube and water should be free from contamination.
(ii) capillary tube should be clean while water may contain some dirt or grease.
(iii) temperature of water should be observed while performing experiment.
(iv) internal diameter of capillary should be measured in two mutually perpendicular direction.
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C
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