problem1) Answer all the problems:

i) Derive an expression for classical drude model theory of electrons in solids.

ii) Name the properties of low sensitivity materials.

iii) prepare an expression of Dulong and Petit Law. Describe its importance.

iv) prepare brief note on meissner effect.

v) Describe and distinguish drift land diffusion current.

problem2) Describe Langovin’s theory of pramagnetism in detail.

problem3) Describe the formation of depletion layer in P–N junction. Compute depletion width and depletion capacitance for P– N junction.

problem4) Describe in detail BCS theory of super conductivity.