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enter image description here I do understand that $ \mathbf b||\mathbf t$ for screw dislocation but I am unable to judge the sign of the dislocation. Again if $\mathbf b \perp \mathbf t$ how do I judge its sign? Any formula which explains the sign and magnitude (to some extent) will be highly appreciated. Here, $\mathbf{b}$ is the Burger's vector and $\mathbf{t}$ is the tangent vector.

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    $\begingroup$ +1 but can you tell us where you found this question? Is your $\mathbf{t}$ the "applied sheer stress" which is often denoted as $\mathbf{\tau}$? $\endgroup$ – Nike Dattani Jan 11 at 6:40
  • $\begingroup$ @NikeDattani Thanks.I found this question in GATE Metallurgical Engineering question papaer(which is precisely a competitive examination at the Undergrad level in India).$t$ is precisely the tangent vector.It has nothing to do with the applied shear stress. $\endgroup$ – user586228 Jan 11 at 7:45

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