Assume there are two screw dislocations in a FCC crystal. If the two dislocations are parallel…

Assume there are two screw dislocations in a FCC crystal. If the two dislocations are parallel to each other and both have Burgers vector of [101], what will be the force on a unit length of one dislocation that is a. 2 exerted by the other dislocation if the two dislocation are 100 nm apart from each other? Assume a 0.25 nm, the shear modulus is 3 GPa.