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Q.

An iron wire and copper wire having same length and cross-section are suspended from same roof Young's modulus of copper is 1/3rd that of iron.  Then the ratio of the weights to be added at their ends so that their ends are at the same level is

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a

1:3

b

1:9

c

3:1

d

9:1

answer is C.

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Detailed Solution

LC =LFe and  AC=AFe

YC=13YFe  

ec =eFe

e=FLAY ⇒ Fα Y

FFeFC=3YFeYFe =31

 

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