Why must charge be attached to mass?

[JANm]

Well to be unnecessarily pedantic, he asked why charges cannot be massless. He didn't ask why mass did not have to be associated with charges, something which your link would bear more relevance to.

Light does not have restmass, but does it have charge?

 

[Redbelly98]

No, light does not have charge, according to currently accepted theory or any efforts to detect it experimentally.

 

[JANm]

Where do you find charges "attracted" by mass? An electron is not attracted by a neutron.

Zz.

So you mean that the hydrogen and the deuterium lines are the same?