PHY 2049: Physics IISlide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15PHY 2049: Physics IIThere is a proposal to move the final to Monday (8/4) from Wednesday (8/6). Any objections?To purchase Wiley Plus, the URL is:http://he-cda.wiley.com/WileyCDA/Section/id-320351.htmlPHY 2049: Physics IIAbout bicycle riding: If some one shows you a trick, it means that,It is possible to do that trickThe person who showed you, can do the trickIt does not mean that you can do the trick.Try it a lot of times and you can too.PHY 2049: Physics IICoulomb’s law: Two kinds of charges, positive and negative, unlike attract, like repel.Electrons and Protons:q = ± 1.602 x 10-19 CCurrent I = dq/dt 1 Amp. = 1 C/sAdd forces as vectorsrrqqkFˆ21221PHY 2049: Physics IIA ruleTry to calculate the force magnitude by ignoring the signs of charges. Then assign the direction by looking at the signs.Never do both (using the charge signs in the calculation of the force and then assign the direction).PHY 2049: Physics IICharges are introducedby rubbing (depends)Touching (same)By induction(opposite)PHY 2049: Physics IIBalls are touched and then separated. Rank them by Charge leftMagnitude of Force beforeAfter Charge transferred3,1,2PHY 2049: Physics IIForce on the center charge = 6kq2/d2dPHY 2049: Physics IIq1 = q4 = Q; q2 = q3 = qwhat is Q/q so that the force on 1 is zeroAll charges same sign. There is no solution.Q and q different sign. There is a possible solution.Is the answer the same if the force on 3 is to be zeroPHY 2049: Physics IIWhat is the force on the central chlorine ion?Suppose that we put in an electron that sits on a cesium site and neutralizes it, which way does the Chlorine move?PHY 2049: Physics IIElectric FieldForce F = qEE = k ∑ rˆ qi/ri2environmentTest charge•Electric field lines denote direction•Their density represents magnitude•They do not crossPHY 2049: Physics IIq1 = 2Qq2 = - 2Qq3 = -4QE at originPHY 2049: Physics II
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