I have read a answer on the site about how moving charges create magnetic fields, which included special relativity. But in low speeds occasions the effects of relativity should be incrediblely small, why we still have to consider it? Since we don't consider the effect of relativity for moving mass point moving with low speed, why consider it for magnetic fields?
I am just a sophomore student and my mother tongue is not English, i would be extremely thankful if you can use simple words. :D