Magnetic Effects of Current & Magnetism · JEE Main previous year questions

2012 3 questions

1. Q492012 · 26 May 2012 · Shift 1

   This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement 1: A charged particle is moving at right angle to a static magnetic field. During the motion the kinetic energy of the charge remains unchanged. Statement 2: Static magnetic field exert force on a moving charge in the direction perpendicular to the magnetic field.

   1. A.Statement 1 is false, Statement 2 is true.
   2. B.Statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation of Statement 1.
   3. C.Statement 1 is true, Statement 2 is false.
   4. D.Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of Statement 1.
   Show answer

   Answer: D

2. Q472012 · 12 May 2012 · Shift 1

   The magnetic force acting on charged particle of charge $2\mu \mathrm{C}$ in magnetic field of $2\mathrm{T}$ acting in $y$-direction, when the particle velocity is $(2\hat{i}+3\hat{j})\times 10^6\mathrm{m}{\mathrm{s}}^{-1}$ is

   1. A.$8\mathrm{N}$ in $z$-direction
   2. B.$8\mathrm{N}$ in $y$-direction
   3. C.$4\mathrm{N}$ in $y$-direction
   4. D.$4\mathrm{N}$ in $z$-direction
   Show answer

   Answer: A

3. Q502012 · 7 May 2012 · Shift 1

   A bar magnet of length $6\mathrm{cm}$ has a magnetic moment of $4\mathrm{J}{\mathrm{T}}^{-1}$. Find the strength of magnetic field at a distance of $200\mathrm{cm}$ from the centre of the magnet along its equatorial line.

   1. A.$4\times 10^{-8}\mathrm{tesla}$
   2. B.$3.5\times 10^{-8}\mathrm{tesla}$
   3. C.$5\times 10^{-8}\mathrm{tesla}$
   4. D.$3\times 10^{-8}\mathrm{tesla}$
   Show answer

   Answer: C