A metallic rod breaks when strain produced is 0.2%.The Young's modulus of the material of the rod is 7x l09 N/m2. What should be its area of cross-section to support a load of 104N ?
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a
7.1 x 10-8m2
b
7.1x10-6m2
c
7.1 x l0-4 m2
d
7.1 x 10-2m2
answer is C.
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Detailed Solution
Maximum possible strain = 0.2/100∴ A=FY× strain =104×1007×109×0⋅2=7⋅1×10−4m2