Not sure about a field being a relation, because a field can exist without a second object.
In most of classical physics, a field can be created by a single entity. A force is created when a second entity interacts with the field of the first. (Or maybe the field of the second interacts with the field of the first.) For example, a star's gravitational field exists whether it has planets or not. If it has planets, the planets also have their own gravitational fields, and the interaction of the planet (or maybe of its gravitational field) with the star's gravitational field creates a force between them.
Best
Hillary
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