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Q.

The elastic limit of brass is 379MPa.The minimum diameter of a brass rod if it is to support a 400N load without exceeding its elastic limit will be 

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a

1.00mm

b

1.16mm   

c

0.90mm.

d

1.36mm

answer is C.

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Detailed Solution

STRESS = FA , Elastic limit is 379 MPa   ⇒379×106=400A=400πd2/4  

d=400×4π×379×106  =1.16×10−3m  =1.16mm

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