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Transcript
ELECTRIC FIELDS One way to describe an electric field is “the alteration of space around an electrically charged object.” With any force field, the objects do not touch. They can be affected if one is in the force field of another. The strength of an electric field is a measure of how great a force will be exerted on a small “test charge” placed in the field. E= F/q Units: N/C An electric field is a vector quantity. (Electric field lines = lines of force) Electric field vectors always point in the direction of the force that would act on a positive test charge. The electric field is zero inside a conducting object. (ex: a car during a thunderstorm) The charge remains on the surface. Calculate electric and gravitational force for a proton and an electron in a hydrogen atom. q = 1.6 x 10-19 C mproton = 1.67 x 10-27 kg melectron = 9.11 x 10-31 kg kc = 9.0 x 109 Nm2/C2 G = 6.67 x 10 -11 2 2 Nm / kg d = 5.29 x 10-11 m