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2015-01-12T02:52:09+05:30

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Shear  stress =  force /area = 20 * 10 N / 5 * 10^-6 m&2
         = 40 * 10^6 N/m^2

Shear strain = theta in radians 
    tan theta  =  10 cm / 50 cm = 0.2
     theta = 0.197 radians or nearly  0.2  radians

 shear modulus = G =  shear stress / shear strain = 200 * 10^6 N/m^2

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