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Download Aim: What is an Electric Field? Do Now: What does the word field
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A region in space in which an electrostatic force acts on a charge Exists around every charged object Mapped by drawing field lines (indicate the direction of the electrostatic force an a + test charge placed in a field.) It is a vector quantity Magnitude is equal to the force exerted per unit charge at that point in the electric field. What does this translate to mathematically? Where: E is the magnitude of the electric field F is the magnitude of the force q is the magnitude of the charge F is measured in Newtons q is measured in Coulomb’s What will E be measured in then? F/q = Newtons/Coulomb’s = E What is the magnitude of the electrostatic force experienced by one elementary charge at a point in the electric field where the electric field intensity is 3.0 x 103 N/C? B + A Point A is 1 meter from sphere, so E = 9 N/C Point B is 3 meters from sphere, so E = ? Based on your answer from the previous slide, where is E stronger? E α 1/d2 E d + + + + + + + E=0 inside + + + + + + + + + - - - - - - - - + + B C A + + + What is E for each point? + + + Do Now: Fill out the scantron for the Winter Break Assignment HW: Quiz tomorrow on Coulomb’s Law and Electric Fields +q - - - - - - - + + + + + + + v Curved path due to electric field on charged particle Older TV’s and inkjet printers use this technology Existing Electric Field F +q d Fe If we push a charge opposite the field direction, work is done WE = F·d Since W = ΔPE, the charge has more potential energy at the final location. V = W/q V = F·d/q V = Ed W = F·d for a constant Force (constant field) F/q = E