1.

A wire elongates by 8 mm when a load of 9 kgis suspended from it. What is the elongationwhen its radius is doubled, if all other quantitiesare the same as before?Ans. 2 mm]

Answer»

Young’s modulus Y = Force x L / A x l

Or rewriting we have Y = WL/Al

\l= WL/ AY

Since the length of the wire is on both sides of the pulley length L/2 will be on both sides.

Thus the elongation of the wire in mm is l mm.

hence answer is 2mm



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