field of force

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A region of space throughout which the force produced by an agent or several agents, such as an electric charge, is operative.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics A force field

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it