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PPE03_ElectricField - Electric Fields Electric Field...

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Electric Fields Electric Fields Electric Field Electric Field © RHJansen
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Fields Gravity Field g Field strength Also the acceleration of gravity Only 9.8 on Earth’s surface. Leave the surface and g changes Electric Field E Field strength Does not give acceleration directly Different in every problem (there is no 9.8 equivalent) © RHJansen
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© RHJansen Electricity Equations are Similar to Gravity F g = Γ μ 1 μ 2 ρ 2 F g = μ 2 γ 1 F E = κ θ 1 θ 2 ρ 2 F E = θ 2 Ε 1 m 1 m 2 q 1 q 2 g 1 = Γ μ 1 ρ 2 E 1 = κ θ 1 ρ 2 m 2 g = Γ μ 1 μ 2 ρ 2 q 2 E = κ θ 1 θ 2 ρ 2
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Solving for the Field Often problems begin by finding the field strength at point P . Then a new mass/charge appears at point P . Typically the problem then asks for the force on the new mass/charge caused by the field of the original mass/charge. © RHJansen g = G m r 2 E = k q r 2 m 1 q 1 P P F g = μ νεϖ γ F E = θ νεϖ Ε m new q new
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g E Field Between Plates Charged plates usually consist of two equal sized plates separated by a distance d . The electric field between two charged plates most closely resembles the gravity field close to the earth, where the flat earth appears most similar to the flat plates. © RHJansen To find the direction of each field test it with a test mass or test charge . Just position an imaginary mass or charge anywhere you need the field direction, and ask yourself the direction that the test mass or charge will move . There is only one kind of mass, but two kinds of charge. Always use a positive test charge ! ! ! − ground + sky + + + + + + + + + + + + m m m m
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Fields Near Point Masses and Point Charges A point mass/charge is an object where the field acts as though it is coming from a single point at the center of the object.
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