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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 38

  • question_answer
    Figure shows the path of an electron in a region of uniform magnetic field. The path consists of two straight sections, each between a pair of uniformly charged plates, and two half-circles. The plates are named 1, 2, 3 and 4. Then

    A) 1 and 3 at higher (positive) potential and 2 and 4 at lower (negative) potential

    B) 1 and 3 at lower potential and 2 and 4 at higher potential

    C) 1 and 4 at higher potential and 2 and 3 at lower potential

    D) 1 and 4 at lower potential and 2 and 3 at higher potential

    Correct Answer: C

    Solution :

    [c] Magnetic force between 1 and 2 acts in downward direction, so electric field must be from 1 to 2. Therefore plate 1 is at higher potential. Similar argument is for lower charged plates.


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