Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 May 2012)

done JEE Main Paper (Held On 12 May 2012) Total Questions - 2

• question_answer1) The magnetic force acting on charged particle of charge \[2\mu C\]in magnetic field of 2 F acting in y-direction, when the particle velocity is \[\left( 2\hat{i}+3\hat{j} \right)\times {{10}^{6}}m{{s}^{-1}}\]is   JEE Main Online Paper (Held On 12 May 2012)
  A)
  8 N in z-direction             
  done clear
  B)
                         8 N in y-direction
  done clear
  C)
                         4 N in y-direction             
  done clear
  D)
                         4 N in z-direction
  done clear
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• question_answer2) The circuit in figure consists of wires at the top and bottom and identical springs as the left and right sides. The wire at the bottom has a mass of 10 g and is 5 cm long. The wire is hanging as shown in the figure. The springs stretch 0.5 cm under the weight of the wire and the circuit has a, total resistance of \[12\Omega .\] When the lower wire is subjected to a static magnetic field, the springs, stretch an additional 0.3 cm. The magnetic field is     JEE Main Online Paper (Held On 12 May 2012)
  A)
  0.6 T and directed out of page
  done clear
  B)
                         1.2 T and directed into the plane of page
  done clear
  C)
                         0.6 T and directed into the plane of page
  done clear
  D)
                         1.2 T and directed out of page
  done clear
  View Answer play_arrow