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

B.TECH.

THEORY EXAMINATION (SEM–II) 2016-17

ENGINEERING PHYSICS-II

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Time: 3 Hours

Max. Marks : 100

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Note: Be precise in your answer. In case of numerical problem assume data wherever not provided.

SECTION – A

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1. Explain the following: 10 x 2 = 20

1. What are polar and non-polar dielectrics?
2. Define magnetic induction and intensity of magnetization.
3. What do by you mean by depth of penetration in a conductor?
4. Explain the concept of Maxwell's displacement current.

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5. What is an intrinsic semiconductor?
6. Define Superconductivity.
7. Define Nanoscience and nanotechnology.
8. Explain the Bragg's law.
9. Define High Temperature Superconductors.

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10. Give the relationship between E, P and D vector.

SECTION – B

2. Attempt any five of the following questions: 5 x 10 = 50

1. Derive an expression for electric field strength on a molecule within dielectric. Hence, obtain Claussius-Mossotti equation.
2. What is Langevin's theory of dia-magnetism? Show that the magnetic susceptibility is negative and independent of temperature.

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3. The permittivity of diamond is 1.46x10^-10 C²N^-1m^-2. Determine its dielectric constant and electrical susceptibility. (Given ?o=8.86x10^-12 C²N^-1m^-2)
4. 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.
5. 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. Calculate the glancing angle for 3rd order diffraction.
6. What is Poynting vector? Discuss the work-energy theorem for the flow of energy in an electromagnetic field
7. Explain type-I and type-II superconductors. Also briefly discuss the important property that change during transition.

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8. 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 H_o(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

1. What are carbon nanotubes? Explain CVC technique for its synthesization.
2. 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.

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3. What is meant by polarization of substance? Mention the different mechanism of polarization in a dielectric.
4. Describe Bragg's spectrometer and derive the necessary formula and explain how it is used to study the structure of crystals.

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