Mention one defect of the Theory of force? short answer he
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Answer:
This paper covers two different but related topics, concerning applications of two kinds of classical theories to line defects. I start the story with a quotation from Nabarro [1], following his interesting Tribute to J. D. Eshelby, “Eshelby maintained this distinction1 rigorously. When he calculated the force between parallel disclinations in a nematic liquid crystal and found that “the supposedly configurational force in a nematic is in fact a real force exerted on the core of the dislocation by the surrounding medium”, he was very disturbed, and he circulated the draft of his paper2 [2] to many colleagues before publishing it.” I was one of the many and, not long before he died, we happened to attend the same meeting, giving us a chance to discuss the matter. My memory is hardly faultless, but I do remember that I mentioned observations which seemed to me relevant, to be mentioned later, but it was obvious that nothing we said brought us closer to a meeting of minds. The idea that a mechanical force might act on a defect has always seemed reasonable to me, but not to him, so I had trouble understanding what it really was that upset him. Since then, much the same issue has come up in discussions and correspondence with a number of workers, indicating that there is quite a bit of confusion about relevant basic concepts, and that there are differences of opinion about this matter of whether defects can feel those mechanical force.
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Answer:
Force field analysis requires the full participation of everyone involved to provide the accurate information required for an effective analysis. Another disadvantage is the possibility that the analysis won't result in a consensus among the group.