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The spring of cross section 2cm 2 is doubled in a length by the application of a longitudinal force 2×10 5 dynes. What is the Young's modulus?
Length gets doubled that means delta l = 2l (due to strain)Y = 2 x 10^5 x 10^-5 x l /2 x 10^-4 x 2l = 2/2 x 2 x 10^-4 = 10^4/2 =50 x 10^2 N/m^2.
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