Solved papers for JEE Main & Advanced JEE Main Paper (Held On 10 April 2015)

done JEE Main Paper (Held On 10 April 2015) Total Questions - 2

• question_answer1) A proton (mass m) accelerated by a potential difference V flies through a uniform transverse magnetic field B. The field occupies a region of space by width 'd?. If \['\alpha '\] be the angle of deviation of proton from initial direction of motion (see figure), the value of sin a will be : JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[{{q}^{V}}\sqrt{\frac{Bd}{2m}}\]                            
  done clear
  B)
  \[Bd\sqrt{\frac{q}{2mV}}\]
  done clear
  C)
  \[\frac{B}{2}\sqrt{\frac{qd}{mV}}\]                        
  done clear
  D)
  \[\frac{B}{d}\sqrt{\frac{q}{2mV}}\]
  done clear
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• question_answer2) If one were to apply Bohr model to a particle of mass 'm' and charge 'q' moving in a plane under the influence of a magnetic field 'B', the energy of the charged particle in the nth  level will be : JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[n\left( \frac{hqB}{2\pi m} \right)\]                      
  done clear
  B)
  \[n\left( \frac{hqB}{8\pi m} \right)\]
  done clear
  C)
   \[n\left( \frac{hqB}{4\pi m} \right)\]                     
  done clear
  D)
  \[n\left( \frac{hqB}{\pi m} \right)\]
  done clear
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