02_20_E_Field - Today 2/20 o E-Field and Coulombs Law...

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Today 2/20 o E-Field and Coulomb’s Law 18.4-5 o HW: “2/20 E Field 1” Due Monday 2/24 o Next week’s lab: “Electrostatics”
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Electric Forces What’s the force on this charge? The net force caused by all the other charges!
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Electric Field What’s the Electric Field at this location? The net Field caused by all the other charges!
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Electric Field “E” o A condition of space caused by the presence of charges. o The field has both size and direction. (it’s a vector) o Far away the field is weak and near charges the field is strong. o A charge placed in an electric field will feel a force. o Charges both cause and react to electric fields
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Force from the Electric Field o F = qE o Put charge q in an E field and it feels a force F o This actually serves to define what we mean by the E field since we measure E with F and q. o Note: q is NOT the charge that is causing E !! (more later)
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Newtons (N) Coulombs (C) Newtons/Coulomb (N/C) q is in units of: So E is in units of: F is in units of: E tells us how many Newtons of force are on q for every Coulomb of charge in q. F = qE
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02_20_E_Field - Today 2/20 o E-Field and Coulombs Law...

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