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IIT JAM 2006

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Brijmohan
Banaras Hindu University (BHU), Varanasi
PhD Condensed matter Physics
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fiziks Forum for CSIR-UGC JRF/NET, GATE, IIT-JAM, GRE in PHYSICAL SCIENCES IIT-JAM-2006(PHYSICS) IMPORTAN NOTE FOR CANDIDTES Attempt ALL 25 questions. Questions 1-15(objective questions) carry six marks each and questions 1625(subjective questions) carry twenty one marks each. Q.1 In a crystalline solid, the energy band structure (E-k relation) for an electron of mass m is given by E 2 k 2k 3 . The effective mass of the electron in the crystal is 2m (a) m (b) 2 m 3 (c) m 2 (d) 2m Q.2 Two electric dipoles P1 and P2 are placed at (0, 0, 0) and (1, 0, 0) respectively, with both of them pointing in the +z direction. Without changing the orientations of the dipoles P2 is moved to (0, 2, 0). The ratio of the electrostatic potential energy of the dipoles after moving to that before moving is (a) 1 16 (b) 1 2 (c) 1 4 (d) 1 8 Q.3 The truth table for the given circuit is J Q K (a) J 0 0 1 1 K 0 1 0 1 Q 1 0 1 0 (b) J 0 0 1 1 K 0 1 0 1 Q 1 0 0 1 fiziks c/o Anand Institute of mathematics, 28-B/6 Jia Sarai Near IIT, Hauz Khas, New Delhi, PIN- 110016 (INDIA) Phone: 011-32718565, +91-9871145498 Website: http://www.physicsbyfiziks.com Email: fiziks.physics@gmail.com 1

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