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two straight wire the length of wire id 10cm the distance between 0.5cm of palleral wire,the sheet makes of water, if the distance between wire increased 1mm of wire, so find the work done? surface tension of water is 0.072N/m
We have,Length of wire = 10cm = 0.1mChange in distance between the two wires = 1mm = 0.001mSo, change in area of one water sheet between the wires = 0.1*0.001 = 10-4m2Change in Surface energy = (surface tension)*(change in area)Now there are two surfaces of water. If we consider the wires to be in the plane of page, then one surface will be towards the reader and another will be on opposite side that is away from reader.So, total change in area of water sheet = 2*10-4m2 Change in Surface energy = (0.072)*(2*10-4) = 1.44*10-3JoulesThe total work done to increase the distance between the wires will store as surface energy that means total work done is change in suface energy. Total work done in increasing the distance between the wires = 1.44*10-3Joules
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