Comments on: The FYS1120 Weekly Assignment Post #2 http://elektromagnetisme.no/2010/09/28/the-fys1120-weekly-assignment-post-2/ The home of FYS1120 Mon, 23 Dec 2013 11:26:13 +0000 hourly 1 https://wordpress.org/?v=4.9.3 By: Andreas Hamre http://elektromagnetisme.no/2010/09/28/the-fys1120-weekly-assignment-post-2/#comment-31 Tue, 12 Oct 2010 21:06:36 +0000 http://mindseye.no/?p=238#comment-31 Another suggestion for 2c:
J = I/A. So if you’re going to make J r dependent, you either have to do something about A or something about I. Changing I wont affect R, so you’re left with doing something about A. But A varies only with x, so there would be no change.

]]> By: Gunnar Raaen http://elektromagnetisme.no/2010/09/28/the-fys1120-weekly-assignment-post-2/#comment-22 Fri, 01 Oct 2010 14:13:47 +0000 http://mindseye.no/?p=238#comment-22 A suggestion for 2c:
If the current density is a function of r, J = J(r) for x=const, the resistivity is not constant in the radial direction, or \rho = \rho(r). I think this would give a different result since R is dependent on the resistivity. If the resistivity somehow remains constant, the result should be as in 2a (or if the total integrated resistivity equals \rho \ \forall \ x).
This may or may not have anything to do with the correct answer :p

]]> By: Mikael B Steen http://elektromagnetisme.no/2010/09/28/the-fys1120-weekly-assignment-post-2/#comment-18 Wed, 29 Sep 2010 19:41:54 +0000 http://mindseye.no/?p=238#comment-18 Hey Gunnar! 🙂 Yeah I see it got lost in the derivation in my notes. Thank you.
Do you have any suggestions for 2 c) btw?

]]> By: Gunnar Raaen http://elektromagnetisme.no/2010/09/28/the-fys1120-weekly-assignment-post-2/#comment-17 Wed, 29 Sep 2010 17:56:45 +0000 http://mindseye.no/?p=238#comment-17 Thanks for the solutions! Nice to have something to compare with.

Exercise 3d: I think \sigma is missing in both \sigma_a and \sigma_b. \kappa is a dimensionless constant 🙂

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