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Q.

The force required to stretch a steel wire of  1 cm2 cross-section to 1.1 times its length would be  (Y=2×1011 Nm−2)

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a

2×106 N

b

2×103 N

c

2×10−6N

d

2×10−7 N

answer is A.

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Detailed Solution

F=A×Y× strain =1×10−4×2×1011×0.1=2×106N
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The force required to stretch a steel wire of  1 cm2 cross-section to 1.1 times its length would be  (Y=2×1011 Nm−2)