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18 August, 01:39

An electron moves at some arbitrary angle to the magnetic field direction (B is in + zˆ direction). The trajectory is a helix with some pitch d. Considering the velocity of an electron in XY plane v and in + z direction vz find d. Hint - consider XY and Z motion independent and calculate the period of circular motion.

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  1. 18 August, 02:00
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    T = d/vz

    Explanation:

    Considering the velocity of an electron in + z direction = vz

    Pitch = d

    The period of circular motion = T = ?

    We can use the formula

    d = T*vz

    then, the period T is

    T = d/vz
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