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Homework Help: Solenoid's magnetic field

  1. Apr 25, 2010 #1
    1. The problem statement, all variables and given/known data
    a solenoids is wound as shown and attached to a battery. two electrons are fired into the solenoid, one from the end and one through a very small hole in the side.

    *I can't attach the picture... so I tried to show you here.*

    .......................... (-)electron 2
    (-) ............... ///////////// solenoid
    electron 1 ........ + - battery

    electron 1 is going into the solenoid, from the left to right
    electron 2 is going into the middle of solenoid, from the top to bottom

    a) in what direction does the magnetic field inside the solenoid point?
    b) is the electron 1 deflected as it moves through the solenoid? if so, in which direction? If not, why not?
    c) is the electron 2 deflected as it moves through the solenoid? if so, in which direction? If not, why not?

    2. Relevant equations

    Right Hand Rule

    3. The attempt at a solution

    I hope you understood the thingy I tried to draw.

    So, the solenoid's top parts going into the paper and bottom parts come out from the paper and the current flows from right to left (+ to -), using the right hand rule, the direction of the magnetic field inside the solenoids should go from the right to the left.

    <- /////// -
    ...... + - (battery)

    so, I said the the electron 1 which goes into the solenoid from left to right, should be deflected due to the its direction is against the direction of magnetic field of the solenoid.

    Then for part c), as it goes into the solenoid, I said it should follow the magnetic field's direction of the solenoid, moving to left as soon as it enters the inside of the solenoid.
    However, I am not so sure of it.

    Can somebody fix this if it is wrong?

    Thank you,
  2. jcsd
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