User talk:Blair Bonnett/Archives/2006/December

Image:Van_der_Pauw_Method_-_Hall_Effect.png
I believe your drawing used to demostrate the Hall Effect is incorrect in two points assuming the current flow is the same direction in each of the four parts. The link is http://en.wikipedia.org/wiki/Image:Van_der_Pauw_Method_-_Hall_Effect.png. Since the electrons are negatively charged, the Lorentz force (qv x B) will actually push the electrons to the other side of the sample than you have drawn in (c) since q = -e (again assuming the current is still out of the screen)! In part (d) where there is an electric field, electrons will always move opposite to the direction of the field lines (again due to q = -e). I am sorry if I have used this page incorrectly, but I am not sure how else to enter a comment.

AJT (Trionfia, 14:05, 13 December 2006)


 * That's OK. I moved the comment into a new section - in future, the best way to enter a new comment is to click the '+' link next to the 'edit this page' link. This will start a new section for the comment. Also, please enter an edit summary (a quick description of your changes) in the box below the main edit box.


 * As for the image, I think you are correct. Using the right-hand rule, the electrons are moving out of the page (part (b)), the field is upwards, so a positive charge would move to the left ==> negative charge would move to the right. Sounds convincing to me - I'll change the image later this evening. Well spotted and thanks for pointing it out.


 * Blair - Speak to me 05:39, 13 December 2006 (UTC)


 * Changed. Blair - Speak to me 08:43, 14 December 2006 (UTC)