The displacement distance of an atom around a dislocation (line defect in a crystal or grains) is called the slip or Burgers vector b and is (a)/(b) to an edge dislocation line. The slip or Burgers vector of a screw dislocation is (c)/(d) to the dislocation line. Choose either (a) or (b) and (c) or (d) to correctly finish the sentence.  A.  (b) perpendicular/ loodreg    B.  (d) perpendicular/ loodreg    C.  (a) parallel    D.  (c) parallel

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The displacement distance of an atom around a dislocation (line defect in a crystal or grains) is called the slip or Burgers vector b and is (a)/(b) to an edge dislocation line. The slip or Burgers vector of a screw dislocation is (c)/(d) to the dislocation line. Choose either (a) or (b) and (c) or (d) to correctly finish the sentence.

 A. 

(b) perpendicular/ loodreg

 
 B. 

(d) perpendicular/ loodreg

 
 C. 

(a) parallel

 
 D. 

(c) parallel

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