Assertion: magnetic field's effect | /r/HasProperty | the observer
Facets:
value: merely
type: DEGREE
Source sentences:
text: Thus, electrostatics, as well as magnetism and magnetostatics, are now seen as studies of the static EM field when a particular frame has been selected to suppress the other type of field, and since an EM field with both electric and magnetic will appear in any other frame, these "simpler" effects are merely the observer's.