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				| 1. | Two opposite sign dislocations are separated by 100 nm in iron with grain size 4 mm. Determine the attractive force and total force on the two dislocations? Shear modulus of iron is 80 GPa, and the lattice parameter is 2.86 Ao | 
| A. | 312.59*10-3 N/m, 1.25*10-9 N | 
| B. | 112.59*10-3 N/m, 8.25*10-9 N | 
| C. | 312.59*10-9 N/m, 1.25*10-3 N | 
| D. | 312.59 N/m, 1.25 N | 
| Answer» B. 112.59*10-3 N/m, 8.25*10-9 N | |