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Q.

A steel wire is 1m long and 1mm2  in area of cross-section. If it takes 200 N to stretch this wire by 1mm how much force will be required to stretch the wire of the same area   and of same material having  length of 10m to 1002 cm

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a

100 N

b

200 N

c

2000 N

d

400 N

answer is C.

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Detailed Solution

Y=FLAe

F∝eℓ⇒F1F2=e1e2×ℓ2ℓ1 

200F2=10−30.02×101

F2=400N

 

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