Ibrahim ya nuna, cewa duka biyu zaton sun kasance m, domin a cikin Lorentz ta ka'idar da contracted electrons, wadanda ba lantarki sojojin da aka bukata domin tabbatar da kwanciyar hankali na al'amarin. Duk da haka, a cikin Ibrahim ta ka'idar da m lantarki, babu irin wannan sojojin da aka bukata. Ta haka ne tambaya ta taso ko da Electromagnetic ra'ayi na duniya (dace da Ibrahim ta ka'idar) ko da na dangantaka Principle (dace da Lorentz ta Theory) ya kasance daidai. A wani lacca a watan Satumba 1904 mai suna St. Louis The Principles of Mathematical Physics, Abraham ya nuna cewa a daya bangaren ka'idar ya yi biyayya da ka'idar na dangi, kuma a daya bangaren da electromagnetic asalin dukan sojojin da aka dauka. Ibrahim ya nuna, cewa duka biyu zaton sun kasance m, domin a Lorentz ta ka'idar da contracted electrons, wadanda ba lantarki sojojin da aka bukata domin tabbatar da kwanciyar hankali na al'amarin. Duk da haka, a cikin Ibrahim ta ka'idar da m electron, babu irin wannan sojojin da aka bukata.
Ka'idar Ibrahim game da tsayayyen lantarki