A steel wire of cross-sectional area 3 x 10-6 m2 can withstand a maximum strain of 10-3, Young's modulus of steel is 2 X 1011 Nm-2. The maximum mass this wire can hold is
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a
40 kg
b
60 kg
c
80 kg
d
100 kg
answer is B.
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Detailed Solution
Maximum stress = Y x (Maximum strain)MgA=2×1011×10−3=2×108Nm−2⇒ Maximum mass of this wire,M=2×108×3×10−610=60kg