Relation to and comparison with other physical fields
|This section requires expansion.|
Electromagnetic and gravitational fieldsSources of electromagnetic fields consist of two types of charge – positive and negative. This contrasts with the sources of the gravitational field, which are masses. Masses are sometimes described as gravitational charges, the important feature of them being that there is only one type (no negative masses), or, in more colloquial terms, 'gravity is always attractive'.
The relative strengths and ranges of the four interactions and other information are tabulated below:
|Chromodynamics||Strong interaction||gluon||1038||1||10−15 m|
|Flavordynamics||Weak interaction||W and Z bosons||1025||1/r5 to 1/r7||10−16 m|