field of force

noun

the region of space surrounding a body, such as a charged particle or a magnet, within which it can exert a force on another similar body not in contact with itSee also electric field, magnetic field, gravitational field

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012