A long crystal is bent to a semicircular shape with a radius of 20 cm. The crystal has a square cross section (2 cm x 2 cm).
(a) If it is assumed that all bending is accommodated by the generation of edge dislocations, calculate the total number of dislocations.
(b) If the magnitude of the Burgers vector of the edge dislocations is 0.32 nm, calculate the dislocation density.