2. Solved Papers
  3. NEET

NEET AIPMT SOLVED PAPER 2001

  • question_answer
                      In a certain region of space electric field \[\vec{E}\] and magnetic field \[\mathbf{\vec{B}}\] are perpendicular to each other and an electron enters in region perpendicular to the direction of \[\vec{B}\] and \[\vec{E}\] both and moves undeflected, then velocity of electron is:                                                                                                                                           

    A)                 \[\frac{|\vec{E}|}{|\vec{B}|}\]

    B)                 \[\vec{E}\times \vec{B}\]            

    C)                 \[\frac{|\vec{B}|}{|\vec{E}|}\]                

    D)                 \[\vec{E}.\vec{B}\]

    Correct Answer: A

    Solution :

                              For electron to pass undeflected, electric force on electron                 = magnetic force on the electron \[i.e.,eE=evB\] \[orv=\frac{E}{B}\] \[orv=\frac{|\vec{E}|}{|\vec{B}|}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner