Question
There is some water in the beaker placed on the pan of a spring balance. If we dip our finger in the water without touching the sides and bottom of beaker, then how does the reading of spring balance change?
Solution
According to Archimedes principle, the water exerts upward thrust on the finger, when we dip the finger in water. Now, as per Newton's third law of motion, the finger will exert equal and opposite force on the water in downward direction. This will result in increase of the weight of water.
Thus, the reading of spring balance will increase.
Thus, the reading of spring balance will increase.
