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CSIR UGC NET 2008 : PHYSICAL SCIENCES - PAPER II

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PHYSICAL SCIENCES PART A 1. The calculation of the probability of excitation of an atom originally in the ground state to an excited state, involves the contour integral ei t 2 2 2 dt (t + ) Evaluate the above integral. d2 x in terms of the Dirac -function. dx 2 2. Evaluate 3. Give the circuit diagram and explain how the photo diode operates in the (a) voltage mode and (b) current mode. What are the practical applications of photo diodes ? 4. An electric field that is constant with time is given in cylindrical polar coordinates by k for 0 R r E = R2 for > R k Here ( = (a) x 2 + y 2 , , z ) are the cylindrical polar coordinates. Evaluate rr E. dl along x2 + y2 = a2 for a < R and for a > R. The contour C C is taken in the counter clockwise direction. (b) (c) r Can E be an electrostatic field? Show that there must be a magnetic field in this space of the form rv rv B0 (r ) + tk for R B (r , t ) = r v for > R B1 (r )

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Additional Info : CSIR UGC (National Eligibility Test) NET New Exam Scheme December 2008 Model Question Paper - Physical Sciences Paper II Joint CSIR UGC NET Exam Question Papers
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