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Chapter 2 Electric Fields

Chapter 2 Electric The Important The Electric FieldSuppose we have a point chargeq0located atrand a set ofexternalcharges conspire so asto exert a forceFon this charge. We can define theelectric fieldat the pointrby:E=Fq0( )The (vector) value of theEfield dependsonlyon the values and locations of the externalcharges, because from Coulomb s law the force on any test charge q0is proportional to thevalue of the charge. However to make this definition really kosher we have to stipulate thatthe test chargeq0is small ; otherwise its presence will significantly influence the locationsof the external Eq.

the test charge q0 is “small”; otherwise its presence will significantly influence the locations of the external charges. Turning Eq. 2.1 around, we can say that if the electric field at some point r has the value E then a small charge placed at r will experience a force F = q0E (2.2) The electric field is a vector.

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