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!

Proportionality relationship and how to convert using it

  1. May 20, 2015 #1
    1. The problem statement, all variables and given/known data
    kjOQXNh.jpg

    2. Relevant equations
    Please see below.

    3. The attempt at a solution

    The idea is to find Bmin. We know: $$
    \tau \frac{eB}{m}\gg 1 \\ \\

    \rightarrow \frac{eB}{m}\gg \tau$$

    Points:

    [1] We are given $$\tau \propto \frac{1}{T^{2}}$$ .

    [2] We are also given a conversion factor $$\tau =10ns \ at \ 1K$$.

    Now, how would you use [1] and [2] to convert 300K?

    I'm assuming you can't just use [2] and do $$300K\cdot \frac{10ns}{1K} = 3X10^{-7}s$$ because of the non-linear relation given in [1].

    Am I just confusing things?


     
  2. jcsd
  3. May 20, 2015 #2

    pasmith

    User Avatar
    Homework Helper

    You are told that [itex]\tau = CT^{-2}[/itex] for some constant [itex]C[/itex], and are given sufficient information to determine [itex]C[/itex].
     
  4. May 21, 2015 #3
    Ahhh, don't know why I didn't think of it like that! Many thanks!!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Proportionality relationship and how to convert using it
Loading...