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     EduGorilla 
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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 > r1and 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

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    1. > 1
    2. =1
    3. < 0.5
    4. between 0.5 and 1
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