A tension specimen of circular cross-section tapers uniformly from 20 mm to 16 mm diameter over a gauge length of 200 mm. When an axial load of 40 JcN is applied, the extension measured on this gauge length is 0-4 mm. Find the modulus of elasticity of the material. Compare the strain energy in this specimen with that in a specimen of the same material of uniform diameter 18 mm carrying the same load. (U. Lond.)

Elements Of Electromagnetics
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A tension specimen of circular cross-section tapers uniformly from 20 mm
to 16 mm diameter over a gauge length of 200 mm. When an axial load of
40 JcN is applied, the extension measured on this gauge length is 0-4 mm. Find
the modulus of elasticity of the material.
Compare the strain energy in this specimen with that in a specimen of the
same material of uniform diameter 18 mm carrying the same load. (U. Lond.)

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