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1. An alien material (not necessarily composed of atomic matter) is a rectangular prism with a square cross section of side length imm with its long side along the r-direction. Suppose this material has a current of 15A traveling in the positive r-direction, each fundamental building block (the "atoms" of this substance) provides one particle of charge +3.2 x 10-1°C which is free to move throughout the substance, on average each of these building blocks has a mass of 7.5 x 10-25kg, and the density of the substance is 6, 370kg/m. (a) What is the drift velocity of the charges in the material? Include the direction (b) Assuming the current density is constant over the cross sectional area and points along the vector normal to this area, find the current density. Include the direction.