Question

a wire of length 2m is made from 10cm of copper. a force F is applied so that it's length increase by 2mm. another wire of length 8m is made from the same volume of copper. if the force F is applied to it, it's length will increase by
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Answer 1

Answer:

A wire of length= 2m

is made from =10cm

of Cooper.A force f is applied so that it's length

increase by= 2mm

another wire of length=8m

is made from the same volume of Cooper.If

the force f is applied to it,its length will increase by

Answer 2

Answer: Correct option: (D) 3.2 cm

Explanation:

Explanation:  ℓ = (FL / AY)

i.e. ℓ = (FL / AY) × L/L = (FL2 / VY) where AL = V

given: volume is constant

F is same

Y is same

∴ ℓ ∝ L^2

(ℓ1 / ℓ2) = (L1 / L2)^2

(2 / ℓ2) = (2/8)2  

(2 / ℓ2) = (1 / 16)

ℓ2 = 32 mm

ℓ2 = 3.2 cm