Solved papers for JEE Main & Advanced JEE Main Online Paper (Held On 23 April 2013)

done JEE Main Online Paper (Held On 23 April 2013) Total Questions - 2

• question_answer1) A rectangular loop of wire, supporting a mass m, hangs with one end in a uniform magnetic filed\[\overset{\to }{\mathop{\operatorname{B}}}\,\]pointing out of the plane of the paper. A clockwise current is set up such that i> mg/Ba, where a is the width of the loop. Then:                 [JEE Main Online Paper ( Held On 23  April 2013 )
  A)
                    The weight rises due to a vertical force caused by the magnetic field and work is done on the system.
  done clear
  B)
                                           The weight do not rise due to vertical for caused by the magnetic field and work is done on the system.
  done clear
  C)
                                           The weight rises due to a vertical force caused by the magnetic field but no work is done on the system.
  done clear
  D)
                                           The weight rises due to a vertical force caused by the magnetic field and work is extracted from the magnetic field.
  done clear
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• question_answer2) A particle of charge \[16\times {{10}^{-16}}\] C moving with velocity  \[10{{\operatorname{ms}}^{-1}}\] along \[x-\] axis enters enters a region where magnetic field of induction \[\overset{\to }{\mathop{\operatorname{B}}}\,\] is along the \[y\]-axis and an electric field of magnitude \[{{10}^{4}}{{\operatorname{V}}^{-1}}\] is along the negative z-axis. If the charged particle continues moving along \[x-axis\], the magnitude of magnitude  of \[\overset{\to }{\mathop{\operatorname{B}}}\,\]is :     [JEE Main Online Paper ( Held On 23  April 2013 )
  A)
                   \[16\times {{10}^{3}}\operatorname{Wb}{{\operatorname{m}}^{-2}}\]              
  done clear
  B)
                                          \[2\times {{10}^{3}}\operatorname{Wb}{{\operatorname{m}}^{-2}}\]
  done clear
  C)
                                          \[1\times {{10}^{3}}\operatorname{Wb}{{\operatorname{m}}^{-2}}\] 
  done clear
  D)
                                          \[4\times {{10}^{3}}\operatorname{Wb}{{\operatorname{m}}^{-2}}\]
  done clear
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