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Q.

A force of 106 N/m2 is required for breaking a material. If the density is 3 × 103 kg m-3 then what should be the maximum length which can be hanged so that it is the point of breaking by its own weight?

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a

34 m

b

340 m

c

3.4 m

d

0.34

answer is A.

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Detailed Solution

Wt. of wire = LAρgand Breaking stress = FA = LAρgA106 = LρgL = 1063×103×9.8 = 34.01 mSo the correct choice is (1).
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