1
$\begingroup$

If there is an electric field which is changing in time, lets say I create one, then it should create a varying magnetic field. So that means that there is an electromagnetic field, and oscillating electromagnetic field is light. So will I see light? A ray of light or something when I create a varying electric field?

$\endgroup$
3

1 Answer 1

3
$\begingroup$

Yes, that's correct in principle.

For visible light, the changes have to occur on time-scales of a femtosecond, $10^{-15}$ seconds, and on spatial scales of about a 100 nanometers, $10^{-7}$ meters, so you have to make the changes very quickly and in a very small space. Usually what you see comes from a whole bunch of little electrons wiggling around very fast.

$\endgroup$
1
  • $\begingroup$ It is not very difficult to generate radio waves with oscillating electric fields. Microwaves were a challenge. $\endgroup$
    – R.W. Bird
    Apr 18, 2022 at 20:41

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.