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PHY 2049: Physics II

PHY 2049: Physics II. Tutoring Center is open in room NPB 1100, M-F 10:00AM -3:00PM. It is free. Hopefully all webassign problems have been solved. Please see me immediately after the class if there is still an issue. PHY 2049: Physics II.

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PHY 2049: Physics II

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  1. PHY 2049: Physics II • Tutoring Center is open in room NPB 1100, M-F 10:00AM -3:00PM. It is free. • Hopefully all webassign problems have been solved. Please see me immediately after the class if there is still an issue.

  2. PHY 2049: Physics II • About bicycle riding: If some one shows you a trick, it means that, • It is possible to do that trick • The person who showed you, can do the trick. • It does not mean that you can do the trick. • Try it a lot of times and you can too.

  3. PHY 2049: Physics II • Force => work => change in K=> change in Potential energy • ΔU = Uf – Ui = -W = - ΔK • Work done is path independent. K+U = constant. U = k q1 q2/r

  4. PHY 2049: Physics II • Electric Potential • V = U/q = -W/q • Units of Joules/coulomb = volt • 1 eV = e x 1V = 1.6 x 10-19 J • Also • V = kq/r • Vf –Vi = -∫E.ds • Add as a number

  5. PHY 2049: Physics II

  6. PHY 2049: Physics II • Rank them by the magnitude of electric field • Which has the field pointed to the right • What does an electron do when released midway

  7. PHY 2049: Physics II

  8. PHY 2049: Physics II • Vf-Vi = -∫ k q/r2 dr • Choose Vi = V (∞)=0 • V(r) = kq/r

  9. PHY 2049: Physics II

  10. V = kpcosθ/r2 • E = -∂V/∂s = - • Uniformly charged disk • V = ??

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