field strength

noun Physics.
the vector sum of all forces exerted by a field on a unit mass, unit charge, unit magnetic pole, etc., at a given point within the field.
Also called field intensity.

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
field strength
1.  radio, television the intensity of an electromagnetic wave at any point in the area covered by a radio or television transmitter
2.  physics See intensity the intensity of an electric or magnetic field

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The interaction is not based on field strength but on induction.
In fact, capability to control the field strength gave them better speed
Changes in climate are drive by long-term changes in the sun's radiative output
  and magnetic field strength.
It takes considerable electromagnetic field strength to extract sufficient
  electrons for this phenomena.
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