Radiation travels in all directions, true — a radio tower, for example, sends radio waves in all directions. Magnetic fields are different, however. When a magnetic field forms, it is only a local field — it doesn’t emanate through space like a radio tower. A changing magnetic field only experiences a load when there is a receiver absorbing the field. The transformers at power stations are an example of this. It is called magnetic induction, and is very different from electromagnetic radiation. https://en.wikipedia.org/wiki/Electromagnetic_induction See? If transformers sent magnetic fields out into space like radio waves, they would not be nearly as efficient! Wireless charging stations are a more modern application, which also demonstrates this.

Written by

Easily distracted mathematician

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store