1. Limited time only! Sign up for a free 30min personal 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!

Right Hand Rule

  1. May 19, 2009 #1

    Air

    User Avatar

    1. The problem statement, all variables and given/known data
    For this given diagram, determine whether the particle is a proton or an electron.
    Diagram-2.jpg

    2. The attempt at a solution
    Considering at the point where it enters the material.
    Using RHR, Velocity is downwards (First Finger), Field is outwards (Middle Finger), Thumb points left but the force is supposed to be to the right so it's an electron.


    3. The Problem encountered
    The answer says that it's a proton but how can that be. Am I doing my RHR correctly? Can someone explain how it works. Thanks in advance.
     
  2. jcsd
  3. May 19, 2009 #2

    dx

    User Avatar
    Homework Helper
    Gold Member

    Why is force supposed to be towards the right? You correctly found that v x B points left at the point where the particle enters the field. The force is F = q(v x B), so if the particle is positively charged, the force will be towards the left and the particle will be deflected towards the left. That's what happens in the picture, so it must be a proton. If q was negative, it would have been deflected towards the right.
     
  4. May 19, 2009 #3

    Air

    User Avatar

    For F=Bil, which fingers represent which part?

    Is it first finger current, middle finger field and thumb is force?
     
  5. May 19, 2009 #4

    LowlyPion

    User Avatar
    Homework Helper

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




Similar Discussions: Right Hand Rule
  1. Right Hand Rule (Replies: 3)

  2. Right Hand Rule (Replies: 3)

  3. Right hand rule (Replies: 3)

Loading...