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Pune University - FY BSc PHYSICS - II, April 2010

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Total No. of Questions : 5] P182 [Total No. of Pages : 3 [3717] - 4 F.Y. B.Sc. PHYSICS - II Emerging Physics and Electricity and Magnetism (Paper - II) (New Course) (11220) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of log tables and calculator is allowed. 4) Draw neat diagrams and sketches wherever necessary. Q1) Attempt all of the following : a) What is population inversion? [2] b) The distance between two consecutive R peaks on the electro cardiograph is 40 mm. If the paper speed of recorder is 48 mm/sec, what is the heat rate? [2] c) Give in short, the contributions of Marie Curie in physics. [2] d) Define a transducer and give two examples. [2] e) Explain Electric Intensity. [2] f) A proton of mass 1.67 x 10 27 kg experiences a force of 3.34 x 10 15N. Calculate the acceleration produced. [2] g) Define magnetic susceptibility. [2] h) Explain time constant in LR circuit. [2] Q2) Attempt any four of the following : a) Write a note on contributions of C.V. Raman and S.Chandrasekhar in development of physics. [4] b) Explain the characteristics of a laser beam. [4] c) Explain photodiode sensors. [4] d) The energy difference between two laser levels is 0.117 eV. Determine the frequency and wavelength of the radiation. [Given : h = 6.626 x 10 34 Js, c = 3 x 108 m/s] [4] P.T.O. e) A nanoparticle with drift velocity 2 x 103 m/s experiences a scattering after 2 picosecond. What will be the mean free path of that particle?[4] f) The intracellular K + c oncentration of group of cell averages 160 x 10 6 moles/cm3. The extra cellular concentration of K+ averages 6 x 10 6 moles/cm3. Calculate Nernst potential. [4] Q3) Attempt any four of the following : a) State principle of superposition in electrostatics and obtain an expression for force on any one charge due to all other charges. [4] b) Using Biot-Savart s law, obtain an expression for magnetic field produced by long straight conductor. [4] c) Explain magnetization and magnetic intensity. d) Calculate the electric intensity and potential due to a point charge 3 x 10 8 Coulomb at a point 25 cm away from it. [Given : 0 = 8.85 x 10 12 c2/N - m2] [4] [4] e) An electric dipole consisting of two opposite charges each of magnitude 2 c is separated by a distance of 3 cm. The dipole is placed in an external field of intensity 2 x 105 N/C. Calculate the maximum torque on the dipole. [4] f) A solenoid of length 100 cm is wound uniformly with 12,000 turns of wire. It carries a current of 3 ampere. What is the value of magnetic field on the axis of the solenoid at the centre? [Given : 0 = 4 10 7 Wb/A m]. [4] Q4) Attempt any two of the following : a) Explain bottom-up approach for synthesis of nanoparticles. What are its advantages and applications? [8] b) i) Describe the contributions of Einstein in physics. ii) The resistance of a platinum wire is 5 ohms at 0oC and 7 ohms at 100oC. Calculate the temperature coefficient of resistance ( ). [4] i) Explain Sodium and Potassium transport in a cell. ii) At what wavelength, the rates of spontaneous and stimulated emission are equal at 585oK? c) [Given : h = 6.626 x 10 34 Js, k = 1.38 x 10 23 J/oK] [3717] -4 2 [4] [4] [4] Q5) Attempt any two of the following : a) What is electric dipole and dipole moment? Obtain an expression for electric potential at any point due to an electric dipole. [8] b) i) State Coulomb s law in electrostatics. Discuss its vector form. [4] ii) The maximum value of the permeability of some metals is 0.12 T.m/A. Find the value of maximum relative permeability and susceptibility. [4] i) What is magnetic flux? Explain Gauss s law for magnetism. ii) A capacitor of capacitance 0.2 F is discharged through a resistance of 107 ohm. Find the time taken for half the charge on the capacitor to escape. [4] c) [3717] -4 3 [4]

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Additional Info : F.Y.B.Sc. PHYSICS - II : Emerging Physics and Electricity and Magnetism (Paper - II) (New Course), Pune University
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