Question

thin and light metal wire is 3 metre long and have a cross sectional area 4 mm square young modulus of metal is 2 into 10 to the power 11 Newton per metre square find the elongation is given cases c
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Answer 1

Force on the wire =mg=100N

Ans a -

Stress (σ)=

A

F

=

4×10

−6

100

=25×10

6

pa

Ans b-

Strain (ϵ)=

Y

σ

=

2×10

11

25×10

6

=12.5×10

−5

Ans c-

Elongation (Δl)=strain×length=37.5×10

−5

m