12th Class Physics Sample Paper Physics Olympiad Sample Paper-1

  • question_answer
    An electron emitted from a hot filament is accelerated through a potential difference    of 2.88 kV and enters a region of a uniform magnetic field \[0.\pi \]at an angle of \[{{30}^{o}}\] with the field. Take the mass of an electron \[9\times {{10}^{-31}}\] kg. The trajectory of the electron is

    A)  Circle of radius 1.6 mm

    B)  Circle of radius 0.9 mm

    C)  Helix of radius 0.9 mm

    D)  Helix of radius 1.6 mm

    Correct Answer: C

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