Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Question about measurements in two systems

  1. Feb 25, 2017 #1
    Imagine that we have an intertial system F, and there is an electric charge Q at the origin. Obviously the field is symmetric and spherical in this reference system.

    Imagine another inertial system F' that is moving at constant speed v to the right respect to F, and at t=t'=0 both origins coincide.

    After one second both systems will measure the intensity of the electric field at an sphere centered at the origin of coordinates (obviously we are talking about an sphere in their own systems of reference).

    According to the measurements of F the field created by Q is spherical, What will be the field measured by F'?

    My guess is this:


    The points x' are contracted, and obviously closer to the charge Q at the origin.
    We know that the instensity of the field is stronger if you are closer to the source, and weaker if you are further away, the system F' will perform measurements closer to the origin than F, Will F' get higher values for the intensity of the electric field?

    Black is F, at rest, F' is green. I have represented in black an sphere in F, and an sphere in F' seen by F.
    Last edited: Feb 25, 2017
  2. jcsd
  3. Feb 25, 2017 #2


    User Avatar
    2017 Award

    Staff: Mentor

  4. Feb 25, 2017 #3
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Question measurements systems Date
I Where is light speed measured from? Jan 19, 2018
I Measuring speed question Dec 23, 2017
A question about measuring time via the speed of light Jun 8, 2014
Question about time and measurement Sep 27, 2013
Question on time measured Aug 1, 2011