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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Magnitude of an Electron's Charge
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e = 1.60 x 10^-19 C
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Coulomb's Law
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The magnitude of the force between two point charges, q₁ and q₂, separated by a distance r is
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F = k|q₁||q₂| / r²
SI Unit: newton, N Electric charges exert forces on one another along the line connecting them: like charges repel, opposites attract. |
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k
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k = 8.99 x 10⁹ N⋅m²/C²
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Superposition
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The electric force on one charge due to two or more other charges is the vector sum of each individual force.
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F1 = F12 + F13 + F14
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Spherical Charge Distributions
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A spherical distribution of charge, when viewed from outside, behaves the same as an equivalent point charge at the center of the sphere.
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The Electric Field
Direction of (E>) |
The electric field is the force per charge at a given location in space.
(E>) points in the direction of the force experienced by a POSITIVE test charge. |
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Point Charge
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The electric field a distance (r) from a point charge (q) has a magnitude given by..
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E = k|q|/r^2
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Rules for drawing Electric Field Lines
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Electric field lines
1) point in the direction of the electric field vector (E>) at all points 2) start at + charges or infinity 3) end at - charges or infinity 4) are more dense the greater the magnitude of (E>) |
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Parallel-Plate Capacitor
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A parallel-plate capacitor consists of two oppositely charged, conducting parallel plates separated by a finite distance.
The field lines between the plates are uniform in the direction (perpendicular to the plates) and magnitude. |
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Characteristic of Excess Charge
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Any excess charge placed on a conductor moves to its exterior surface.
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Electric Fields at Conductor Surfaces
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Electric field lines contact conductor surfaces at right angles.
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A conductor can be charged without direct physical contact with another charged object. This is charging by..
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Charging by Induction
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Electric Flux
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If an area (A) is tilted at an angle θ to an electric field (E>), the electric flux through the area is..
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Φ = EAcosθ
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Gauss's Law
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Gauss's Law states that if a charge q is enclosed by a surface, the flux through the surface is..
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Φ = q/ε₀
Gauss's Law is used to calculate the electric field in highly symmetric systems. |
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ε₀
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The Permittivity of Free Space
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ε₀=1/4(pi)k=8.85 x 10^-¹² C²/N⋅m²
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