Solved papers for JEE Main & Advanced JEE Main Paper (Held On 25 April 2013)

done JEE Main Paper (Held On 25 April 2013) Total Questions - 2

• question_answer1)                 One of the two small circular coils, (none of them having any self-inductance) is suspended with a V-shaped copper wire, with plane horizontal. The other coil is placed just below the first one with plane horizontal. Both the coils are connected in series with a de supply. The coils are found to attract each other with a force. Which one of the following statements is incorrect?     JEE Main Online Paper ( Held On 25  April 2013 )
  A)
                  Both the same carry currents in the same direction
  done clear
  B)
                                         Coils will attract each other, even if the supply is as source.
  done clear
  C)
                                         Force is proportional to \[{{\operatorname{d}}^{-4}}\], d = distance between the centres of the coils.
  done clear
  D)
                                         Force is proportional to \[{{\operatorname{d}}^{-2}}\]
  done clear
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• question_answer2)                 A metal sample carrying a current along X-axis with density \[{{J}_{x}}\]is subjected to a magnetic filed\[{{\operatorname{B}}_{z}}\](along-z axis). The electric field \[{{\operatorname{E}}_{y}}\]developed along Y-axis is directly proportional to \[{{\operatorname{J}}_{x}}\]as well as \[{{B}_{z}}\]. The constant of proportionality as has SI unit.     JEE Main Online Paper ( Held On 25  April 2013 )
  A)
                  \[\frac{{{m}^{2}}}{A}\]                                 
  done clear
  B)
                                         \[\frac{{{m}^{3}}}{A\operatorname{s}}\]
  done clear
  C)
                                         \[\frac{{{m}^{2}}}{A\operatorname{s}}\]                                            
  done clear
  D)
                                         \[\frac{{{\operatorname{A}}_{\operatorname{S}}}}{{{\operatorname{m}}^{3}}}\]
  done clear
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