If you turn on Use Max Distance, connected objects within the area defined by the Max Distance setting are affected by the uniform field. Any connected objects outside the Max Distance are not affected by the uniform field.
If you turn off Use Max Distance, all connected objects are affected by the uniform field, no matter how far away they are from the uniform field.
Sets where the field emanates from the object. If you turn on Apply Per Vertex, each individual point (CV, particle, vertex) of the chosen object exerts the field equally at full strength. If you turn off Apply Per Vertex, the field is exerted only from the average position of the specified points.
If you are using the Attribute Editor, open the Special Effects section to display the Apply Per Vertex attribute.