Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 April 2014)

done JEE Main Paper (Held On 12 April 2014) Total Questions - 2

• question_answer1) A positive charge 'q' of mass 'm' is moving along the + x axis. We wish to apply a uniform magnetic field B for time \[\Delta t\]so that the charge reverses its direction crossing the y axis at a distance d. Then:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[B=\frac{mv}{qd}\]and\[\Delta t=\frac{\pi d}{v}\]
  done clear
  B)
  \[B=\frac{mv}{2qd}\]and\[\Delta t=\frac{\pi d}{2v}\]
  done clear
  C)
  \[B=\frac{2mv}{qd}\]and\[\Delta t=\frac{\pi d}{2v}\]
  done clear
  D)
  \[B=\frac{2mv}{qd}\]and\[\Delta t=\frac{\pi d}{v}\]
  done clear
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• question_answer2) Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is bent into a loop and produces magnetic field \[{{B}_{1}},\] at its centre when a current I passes through it. The ratio \[{{B}_{1}}:{{B}_{2}}\] is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  1 : 1                                       
  done clear
  B)
  1 : 3
  done clear
  C)
  1 : 9                                       
  done clear
  D)
  9 : 1
  done clear
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