Download AKTU B-Tech 2nd Sem 2016-17 AS202E Engineering Physics II Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 2nd Semester (Second Semester) 2016-17 AS202E Engineering Physics II Question Paper

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B.TECH.
THEORY EXAMINATION (SEM?II) 2016-17
ENGINEERING PHYSICS-II
T ime : 3 Hours Max. Marks: 100
Note .? Be precise in your answer. In case ofnumerical problem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 x 2 = 20
a) What are polar and non?polar dielectrics? e) What is an intrinsic semiconductor?
b) De?ne magnetic induction and intensity of 1) De?ne Superconductivity.
magnetization. g) De?ne Nanoscience and nanotechnology.
c) What do by you mean by depth of h) Explain the Bragg?s law.
penetration in a conductor? i) De?ne High Temperature Superconductors.
(1) Explain the concept of Maxwell?s j) Give the relationship between E, P and D
displacement current. vector.
SECTION ? B
2. Attempt any ?ve of the following questions: 5 x 10 = 50
(a) Derive an expression for electric field strength on a molecule within dielectric. Hence,
obtain Claussius?Mossotti equation.
(b) What is Langevin?s theory of dia?magnetism? Show that the magnetic susceptibility is
negative and independent of temperature.
(c) The permittivity of diamond is 1.46X10'10 CZN'lm'Z. Determine its dielectric constant
and electrical susceptibility. (Given 30:8.86x10'12 CZN'lm'z)
(d) An iron rod of volume 10'3 m3 and relative permeability 1200 is placed inside a long
solenoid wound with 5 turns/cm. If a current of 0.5 amp is passed through the solenoid,
find the magnetic moment of the rod
(e) A beam ofX?rays 2:08 A is incident on a crystal at a glancing angle of 8035? when the
first order Bragg?s diffraction occurs. Calculating the glancing angle for 3rd order
diffraction.
(1) What is Poynting vector? Discuss the work?energy theorem for the ?ow of energy in an
electromagnetic ?eld
(g) Explain type?I and type?II superconductors. Also brie?y discuss the important property
that change during transition.
(h) How does superconducting transition temperature vary with magnetic field? The
transition temperature for Pb is 7.2 K. However it losses the superconductivity property
if subjected to a magnetic ?eld of 3.3X104 Amp/m. ?nd the value of Hc(0) which will
allow the metal to retain its superconductivity at 5K.
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
3 (i) What are carbon nanotubes? Explain CVC technique for its synthesization.
(ii) Assuming that all the energy from a 1000 Watt lamp is radiated uniformly; calculate
the average value of intensities of electric and magnetic fields of radiation at a distance
of 2 meter from lamp.
4 What is meant by polarization of substance? Mention the different mechanism of polarization
in a dielectric.
5 Describe Bragg?s spectrometer and derive the necessary formula and explain how it is used to
study the structure of crystals.