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 - 3

• question_answer1)                 Consider a finite insulated, uncharged conductor placed near a finite positively charged conductor. The uncharged body must have a potential:     [JEE Main Online Paper ( Held On 23  April 2013 )
  A)
                    less than the charged conductor more than at infinity
  done clear
  B)
                                           more than the charged conductor and less than at infinity.
  done clear
  C)
                                           more than the charged conductor and more than at infinity.
  done clear
  D)
                                           less than the charged conductor and less than at infinity
  done clear
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• question_answer2)                 A parallel plate capacitor of area 60 \[{{\operatorname{cm}}^{2}}\] and separation 3 mm is charged  initially to \[90\mu \operatorname{C}.\] If the medium between the plate gets slightly conducting and the plate loses the charge initially at the rate of \[2.5\times {{10}^{-8}}\operatorname{C}/s,\] then what is the magnetic field between the plates?     JEE Main Online Paper ( Held On 23  April 2013 )
  A)
                   \[2.5\times {{10}^{-8}}\operatorname{T}\]                        
  done clear
  B)
                                          \[2.0\times {{10}^{-7}}\operatorname{T}\]
  done clear
  C)
                                          \[1.63\times {{10}^{-11}}\operatorname{T}\]                   
  done clear
  D)
                                           Zero
  done clear
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• question_answer3) A liquid drop having 6 excess electrons is kept stationary under a uniform electric field of \[25.5{{\operatorname{KVm}}^{-1}}\]. The density of liquid is\[1.26\times {{10}^{3}}\]. The radius of the drop is (neglect buoyancy)     JEE Main Online Paper ( Held On 23  April 2013 )
  A)
  \[4.3\times {{10}^{-7}}\operatorname{m}\]       
  done clear
  B)
         \[7.8\times {{10}^{-7}}\operatorname{m}\]
  done clear
  C)
  \[0.078\times {{10}^{-7}}\operatorname{m}\]
  done clear
  D)
         \[3.4\times {{10}^{-7}}\operatorname{m}\]
  done clear
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