Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length by
A. Half
B. Same amount
C. Double
D. One-fourth
Answer: Option B
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A. Equal to
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Young's modulus, E =
strain
stress
Where, strain=
original length
change in length
Let the initial length of the wire be x m.
Thus change in length =2x−x=x
Original length =x
So, strain = 1
So, we get E= stress/1