1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Magnetron Electron Field Strength

  1. Oct 19, 2008 #1
    1. The problem statement, all variables and given/known data
    Suppose the resonant frequency is f = 1.47×1010 s−1; that is, the electron period of revolution is T = 6.80×10-11 s. What is the corresponding strength of the magnetic field?


    2. Relevant equations
    qvb=mv2/r
    qb=mv/r


    3. The attempt at a solution
    1.6E-19*b=9.1E-31*v/r

    I understand the general idea, to figure out b, but I don't understand how to figure out Velocity or Radius from the frequency/period.

    Can someone give me a point in the right direction?
     
  2. jcsd
  3. Oct 20, 2008 #2

    alphysicist

    User Avatar
    Homework Helper

    Hi haxxorboi,

    When they give the period, that is the period of what? In other words, if the period is 6.80×10-11 s, what happens every 6.80×10-11 seconds? Once you answer that, you should be able to write down an equation relating T, r, and v. What do you get?
     
  4. Oct 20, 2008 #3
    Velocity=Distance/Time
    Velocity=Circumference/Period
    Velocity=2*Pi*R/6.8E-11 sec
    Velocity=9.24E10R

    1.6E-19*B=9.1E-31*(9.24E10R)/R

    B=.5253 T


    Thank you very much, that was killing me!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Magnetron Electron Field Strength
  1. Field strength (Replies: 3)

  2. Field strength! (Replies: 2)

  3. The magnetron (Replies: 16)

Loading...