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IIT JAM 2016

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Brijmohan
Banaras Hindu University (BHU), Varanasi
PhD Condensed matter Physics

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JAM 2016 PHYSICS - PH SECTION A MULTIPLE CHOICE QUESTIONS (MCQ) Q. 1 Q.10 carry one mark each. Q.1 For an infinitely long wire with uniform line-charge density, , along the z-axis, the electric field at a point (a,b,0) away from the origin is ( , , and are unit vectors in Cartesian coordinate system. ) (A) (C) Q.2 2 0 2 + 2 2 0 2 + 2 . 1 (C) 2 1 16 2 + . + . (C) Circular path ; = 1 s. 2 + 2 ) 2 0 2 + 2 ( + ). . 1 (B) 16 + . (D) 1 4 2 + . (B) Helical path ; = 2/3 s. (D) Circular path ; = 2/3 s. Consider a particle of mass following a trajectory given by = 0 cos 1 and = 0 sin 2 , where 0 , 0 , 1 , and 2 are constants of appropriate dimensions. The force on the particle is (A) central only if 1 = 2 . (C) always central. PH (D) 0 ( A charged particle in a uniform magnetic field = 0 starts moving from the origin with velocity = (3 + 2 ) / . The trajectory of the particle and the time at which it reaches 2 meters above the xy- plane are ( , , and are unit vectors in Cartesian coordinate system. ) (A) Helical path ; = 1 s. Q.4 (B) 2 A 1 W point source at origin emits light uniformly in all the directions. If the units for both the axes are measured in centimetre, then the Poynting vector at the point (1,1,0) in W/cm2 is ( , , and are unit vectors in Cartesian coordinate system. ) (A) 8 Q.3 + . (B) central only if 0 = 0 and 1 = 2 . (D) central only if 0 = 0 and 1 2 . 2/18

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