This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Square Law Spheres.svg Spheres with radii of and all centred on central point An example of spheres like this is equipotentials around point charge selfmade Inkscape Inductiveload Spheres Electrostatics
Page 2023 Free-images.com. All images are Public Domain