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# UCF PHY 2054C - Coulombs Law

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Coulomb’s LawThis WeekGood Table PhysicsRubbingsSimulationsHardware SimulationElectric Hockey SumulationCoulomb’s Law SimulationLast Time My DataGraph - LinearA Little Algebra:Ln-LnSlide 13Slide 14Slide 15Slide 16Slide 17Week 2.2Today – Coulomb/Electric Field(?)Friday – Quiz #1 + More of WednesdayY Y YY Y YYY NY NNNNNNNThere are two kinds of simulations•Hardware – “Mission Space”•Software – Software•Games – Madden Game•Training – Military at RDECOM/STRICOM•Education – The Electric Hockey GameThe “Game” aspect•Allowed you to get a feel for how charged particles move under the influence of coulomb forces.•Did you notice any “orbits”??The “Measurement” aspect•Simulator incorporates accurate model of coulomb forces.•You can “explore” how these forces behave and get a feel for how they vary with distance.Coulomb’s Law SimulationrForceDistance (r) Force2.0 32.52.8 16.03.0 11.73.8 8.04.8 4.85.5 3.36.7 2.38.0 1.69.0 1.310.3 0.811.3 0.71 22 2:ln( ) ln( ) 2ln( )Coul ombq qCF kr rF c r= == -Straight LineIn the figure, three charged particles lie on a straight line and are separated by a distance d. Charges q1 and q2 are held fixed. Charge q3 is free to move but happens to be in equilibrium (no net electrostatic force acts on it).OBSERVATIONSThe force from q1 is the same as the force from q2.The charge on q1 is must be bigger than the force on q2The two charged must be OPPOSITE in sign.1 21 3 2 32 2121 2( )(2 )44F Fq q q qk kd dqqq q=-==-=-In the basic CsCl (cesium chloride) crystal structure, Cs+ ions form the corners of a cube and a Cl- ion is at the cube's center (See Figure). The edge length of the cube is 0.4 nm. The Cs+ ions are each deficient by one electron (and thus each has a charge of +e), and the Cl- ion has one excess electron (and thus has a charge of -e).What is the magnitude of the net electrostatic force exerted on the Cl- ion by the eight Cs+ ions at the corners of the cube?Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle, as the drawing shows. The magnitude of each of the charges is 5.0 µC, and the lengths of the sides of the triangle are 5.0 cm. Calculate the magnitude and direction that charge B

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