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!

Find number of turns in the solenoid

  1. Nov 2, 2009 #1
    1. The problem statement, all variables and given/known data
    I have the following information about the problem.

    i have the speed of an electron = v
    the diameter of a circular path = d
    the length of a solenoid = x
    the current that the solenoid carried = I

    I need to find the number of turns in the solenoid.
    2. Relevant equations

    i used the following equations
    QvB=v2m/r

    B=[tex]\mu[/tex]NI/l

    3. The attempt at a solution

    then i put "B" in the first equation and i solve for N. Is that correct?
     
    Last edited: Nov 2, 2009
  2. jcsd
  3. Nov 3, 2009 #2

    rock.freak667

    User Avatar
    Homework Helper

    Re: solenoid

    Yes, do that.
     
  4. Nov 3, 2009 #3
    Re: solenoid

    the only weird thing is that i get a number like

    .121

    and it is not a turn .121??? or it can be a valid answer?
     
  5. Nov 3, 2009 #4

    rock.freak667

    User Avatar
    Homework Helper

    Re: solenoid

    no, you can't really get less than one. Post the numbers and your working and we'll see if you went wrong anywhere.
     
  6. Nov 3, 2009 #5
    Re: solenoid

    v=1570 m/s
    d = 1.57 cm
    x = 35 cm
    I = 2.61 A
    what I did is :
    N=(vmx)/(rQI*4*pi*10^-7)
     
  7. Nov 3, 2009 #6

    rock.freak667

    User Avatar
    Homework Helper

    Re: solenoid

    I get the same answer as you, so I guess you'll need to put what you get and round up and put N=1
     
  8. Nov 3, 2009 #7
    Re: solenoid

    the problem really states....

    ....that the electron follows a circular path of diameter 1.57 cm near the center of an evacuated solenoid of length 35 cm .

    does that changes anything?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find number of turns in the solenoid
  1. Solenoid turns (Replies: 1)

Loading...