Three different Si samples maintained at \\( 300 \\mathrm{~K} \\) are characterized by the following energy band diagrams. Assume the electric potential \\( V \\) is zero at \\( x=0 \\) for all cases. For each Si sample, answer the questions below. (a) Do equilibrium conditions prevail? How do you know? (b) Sketch the electric potential \\( V \\) inside the material as a function of \\( x \\). Assume \\( V(0)=0 \\). (c) Sketch the electric field \\( \\mathcal{E} \\) inside the material as a function of \\( x \\). (d) How does the electron concentration \\( n \\) and hole concentration \\( p \\) change with \\( x \\) ? (e) Identify the direction of the electron and hole drift current at \\( x=\\frac{L}{2} \\). (f) Identify the direction of the electron diffusion current at \\( x=\\frac{L}{2} \\). (1) (2)