An open U-tube of uniform cross-section contains mercury. When 27.2 cm of water is poured into one limb of the tube, then the difference in levels of liquids of the two sides is (r water = 1gm/cm3 and rHg = 13.6gm/cm3) 1) 23.2cm 225.2cm 3) 21.2cm 4) None
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