Multiple choice

The stiffness coefficient kij indicates

  1. force at i due to a unit deformation at j

  2. deformation at j due to a unit force at i

  3. deformation at i due to a unit force at j

  4. force at j due to a unit deformation at i
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A Correct answer
Explanation

 Stiffness coefficient $K_{ij} =$ Force required to produce unit deformation and $K_ij$ means force required in i for unit deformation at j.

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