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IIT-Jam-2016-Physics-Solutions

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IIT JAM-2016 PHYSICS-SOLUTIONS (a) (c) Ans. (b) 2 2 0 a b x be y ) (b) 2 a 2 b 2 (ae 0 x e y ) (e 2 2 0 a b 2 CA TIO , e y and e z are unit vectors in Cartesian-Coordinate system.) (e 2 N 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 x e (d) y 2 0 a 2 b 2 z e r e EC TO RY ED U (a, b,0) x r E = 2 r e r = a 2 b2 x be y r ae r = e r a 2 b2 E = x be y ) (ae 2 (a 2 b 2 ) 2. A 1W 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/cm 2 is (a) (b) 1 x e y ) (e 16 1 x e y ) (e 16 2 (d) 1 x e y ) (e 4 2 TR AJ (c) 1 x e y ) (e 8 2 Ans. (a) P r S = 4 r 2 e r= 2 r = e x e y e 2 1

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