Nalanda Open University 2009 B.Sc Physics Final , Bachelor of Science Hons., Part-II - IV (Electrostatics and Magnetism, Current, Electricity and Modern ) - Question Paper
Final Examination, 2009 Bachelor of Science (Physics) Hons., Part-II
Paper- IV (Electrostatics and Magnetism, Current, Electricity and Modern Physics)
Final Examination, 2009 Bachelor of Science (Physics) Hons., Part-II Paper-IV (Electrostatics and Magnetism, Current, Electricity and Modern Physics)
Time: 3.00 Hrs. Full Marks: 75
Answer any Five Questions.
1. A square sheet of side 'a' is uniformly charged with charge density G. Show that the potential at the centre of the square is
= --/n(l + V2)
Ta * 71 G
2. Derive Poisson's equation and Laplace's equation.
Two parallel planes of infinite extent in the x- and y- direction and separated by a distance d in the Z-direction have a p.d. applied between them. Find the potential distribution and electric field strength in the region between the planes.
3. Describe Langevin's theory of paramagnetism. What is Curie's law? Discuss its limitations.
4. What is theorem-electric power? How does it vary with the temperature of hot junction? Obtain expressions for Peltier coefficient and Thomson co-efficient in terms of thermo-electric power for a thermocouple.
5. Obtain an expression for the growth and decay of charge in a condenser through a resistance. What is the time constant of the circuit?
6. Discuss the theory of Anderson bridge for the measurement of self-inductance.
7. Describe the J.J. Thomson's method of determination of specific charge of an electron.
8. Give an account of the nuclear liquid drop model. Explain nuclear fission.
9. Describe Davision and Germer experiment for the study of electron diffraction. What are the results of the experiment?
10. What is Compton effect? Show that the shift in wavelength is given by
A/l = (1 - cos (f>) m0c
where symbols have usual meaning.
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