Solved papers for JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

done JEE Main Paper (Held On 19 May 2012) Total Questions - 3

• question_answer1) A coil of self inductance L is connected at one end of two rails as shown in figure. A connector of length l, mass m can slide freely over the two parallel rails. The entire set up is placed in a magnetic field of induction B going into the page. At an instant t = 0 an initial velocity Vg is imparted to it and as a result of that it starts moving along x-axis. The displacement of the connector is represented by the figure.     JEE Main  Online Paper (Held On 19  May  2012)
  A)
                                                
  done clear
  B)
  
  done clear
  C)
                                                                             
  done clear
  D)
                        
  done clear
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• question_answer2)                 This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement 1: Self inductance of a long solenoid of length L, total number of turns N and radius r is less than \[\frac{\pi {{\mu }_{0}}{{N}^{2}}{{r}^{2}}}{L}.\] Statement 2: The magnetic induction in the solenoid in Statement 1 carrying current I is \[\frac{{{\mu }_{0}}NI}{L}\]in the middle of the solenoid but becomes less as we move towards its ends.     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  Statement 1 is true. Statement 2 is false.
  done clear
  B)
                         Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of Statement 1.
  done clear
  C)
                         Statement 1 is false. Statement 2 is true.
  done clear
  D)
                         Statement 1 is true. Statement 2 is true, Statement 2 is not the correct explanation of Statement 1.
  done clear
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• question_answer3) A generator has armature resistance of \[0.1\Omega \]and develops an induced emf of 120 F when driven at its rated speed. Its terminal voltage when a current of 50 A is being drawn is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  120 V                                    
  done clear
  B)
                         5V
  done clear
  C)
                         115 V       
  done clear
  D)
                         70 V
  done clear
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