THEORY EXAMINATION (SEM–II) 2016-17 ENGINEERING PHYSICS - II

This question paper covers essential topics of crystal physics, electromagnetism, dielectric behavior, magnetic properties, semiconductor physics, and superconductivity.
It is divided into three sections assessing definitions, theoretical concepts, numerical applications, and analytical explanations.

SECTION – A (7 × 2 = 14 Marks)

This section contains seven short questions, each requiring brief, precise definitions.
Topics include:

Unit cell in crystal structures

Compton effect

Polarization in dielectrics

Magnetic susceptibility

Maxwell’s displacement current

Effective mass of electrons in solids

Meissner effect in superconductors

This section tests fundamental concepts and basic understanding.

SECTION – B (3 × 7 = 21 Marks)

Students must attempt any three medium-length descriptive questions.
Topics include:

Bragg’s X-ray spectrometer and crystal structure analysis

Langevin’s theory of diamagnetism and negative susceptibility

Maxwell’s equations in free space & orthogonality of E, H, and propagation direction

Formation of energy bands; comparison of conductors, semiconductors & insulators

Buckyballs (Fullerenes): preparation, properties, applications

This section evaluates conceptual clarity, derivation skills, and theoretical reasoning.

SECTION – C (5 × 7 = 35 Marks)

Students must attempt multiple sub-questions from four groups, each covering advanced concepts and numerical problems.

Group 3 — Crystal Physics

Crystal structure of NaCl

Miller indices and method of determination

Interplanar spacing for cubic planes like (101), (112)

Group 4 — Dielectrics & Magnetism

Effect of AC electric fields on dielectric constant

Calculation of relative permittivity

Hysteresis and energy loss per cycle using B–H curve

Group 5 — Electromagnetic Theory

Equation of continuity & its significance

Poynting theorem and energy flow in EM fields

Skin depth calculation for good conductors

Group 6 — Semiconductors

Conductivity of intrinsic and extrinsic semiconductors

Fermi–Dirac distribution at different temperatures

Numerical problem on current through a semiconductor slab

Group 7 — Superconductivity

Transition temperature & effect of magnetic field

Type-I vs Type-II superconductors & magnetization curves

Numerical problem on critical magnetic field of lead

This section tests numerical ability, derivations, deeper understanding, and application of physical laws.