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The cross sections of two hollow bars made of the same material are concentric circles as shown in the figure. It is given that r3​>r1​ and r4​>r2​ and that the areas of the cross-sections are the same.J1 and J2 are the torsional rigidities of the bars on the left and right, respectively. The ratio J2/J1 is
  • a)
    >1
  • b)
    <0.5
  • c)
    1
  • d)
    between 0.5 and 1
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The cross sections of two hollow bars made of the same material are co...
C.S. area of both is same

Torsional rigidity
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The cross sections of two hollow bars made of the same material are concentric circles as shown in the figure. It is given that r3>r1 and r4>r2 and that the areas of the cross-sections are the same.J1 and J2 are the torsional rigidities of the bars on the left and right, respectively. The ratio J2/J1 isa)>1b)<0.5c)1d)between 0.5 and 1Correct answer is option 'A'. Can you explain this answer?
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