collect four springs of same length made of steel, iron, copper and brass. the thickness of wire in all the springs should also be same. first take the steel spring. fix its one end with a rigid stand and fix a hanger towards the other end on which weights can be placed. also fix a scale along its side towards the other end. Place a 50g load on the hanger and measure the extension. add 50g load on the hanger in about 5 steps and measure he extension each time. plot a graph between load extension. repeat this activity with springs made of iron, copper, and brass. plot load extension graph in each case compare these graphs. which of the above materials obey hooke's law?
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