1f=μgμsurrounding-11r1-1r2 10.2=1.5-11r1-1r2....(i); 1fW=1.51.33-11r1-1r2.....(ii) (i)÷(ii)⇒fw0.2=0.51.51.33-1⇒fw=0.782m
অতএব, পরিবর্তন= (0.782-0.2) = 0.582 m
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