- #1
The Head
- 144
- 2
I am confused about electromagnetic fields. I am fine with the ideas of how photons are emitted from an object (whether through electron excitation or nuclear fusion) and I understand that any electromagnetic radiation contains an electric field as well as a magnetic field, but I am having trouble grasping why these fields exist.
For example, an electric field exists in a thunderstorm because of a charge separation between the clouds and the ground, creating a potential between the two. And as far as I understand, this is how you produce an electric field (have charge separation). What I don't understand is how light that is already moving can create a variable electric field. What exactly sustains this electric field and causes it to oscillate? Is there a voltage difference? Similarly, I am confused with magnetic fields in EMR.
I have a feeling I have a fundamental misunderstanding about light. Could anyone please offer some insight? Thank you!
For example, an electric field exists in a thunderstorm because of a charge separation between the clouds and the ground, creating a potential between the two. And as far as I understand, this is how you produce an electric field (have charge separation). What I don't understand is how light that is already moving can create a variable electric field. What exactly sustains this electric field and causes it to oscillate? Is there a voltage difference? Similarly, I am confused with magnetic fields in EMR.
I have a feeling I have a fundamental misunderstanding about light. Could anyone please offer some insight? Thank you!