Time: 3 Hours
Max. Marks : 100
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B.TECH.
THEORY EXAMINATION (SEM–II) 2016-17
ENGINEERING PHYSICS-II
Note: Be precise in your answer. In case of numerical problem assume data wherever not provided.
SECTION – A
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- What are polar and non-polar dielectrics?
- Define magnetic induction and intensity of magnetization.
- What do you mean by depth of penetration in a conductor?
- Explain the concept of Maxwell's displacement current.
- What is an intrinsic semiconductor?
- Define Superconductivity.
- Define Nanoscience and nanotechnology.
- Explain the Bragg's law.
- Define High Temperature Superconductors.
- Give the relationship between E, P and D vector.
1. Explain the following: 10 x 2 = 20
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SECTION – B
- (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 C²N?¹m². Determine its dielectric constant and electrical susceptibility. (Given ?0=8.86x10-12 C²N?¹m?²)
- (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 of X-rays ?=0.8 Å is incident on a crystal at a glancing angle of 8°35' when the first order Bragg's diffraction occurs. Calculating the glancing angle for 3rd order diffraction.
- (f) What is Poynting vector? Discuss the work-energy theorem for the flow of energy in an electromagnetic field.
- (g) Explain type-I and type-II superconductors. Also briefly 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 field of 3.3x104 Amp/m. find the value of H0(0) which will allow the metal to retain its superconductivity at 5K.
Attempt any five of the following questions: 5 x 10 = 50
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SECTION - C
- (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.
- What is meant by polarization of substance? Mention the different mechanism of polarization in a dielectric.
- Describe Bragg's spectrometer and derive the necessary formula and explain how it is used to study the structure of crystals.
Attempt any two of the following questions: 2 x 15 = 30
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