PHY 2049 Physics II n n Tutoring Center

PHY 2049: Physics II n About bicycle riding: If some one shows you a

PHY 2049: Physics II What have we learned n Coulomb’s law, electric field, Gauss’

PHY 2049: Physics II • Calculate the Electric Field at P • Calculate the

PHY 2049: Physics II • Point charge • Distribution of charges • Line charge

PHY 2049: Class Quiz If 500 J of work are required to carry a

Some old business: What is the electric field of a shell of a uniform

PHY 2049: Physics II n E R V r The potential of a uniform

n n n Two particles with charges Q and -Q are fixed at the

PHY 2049: Physics II n n n a= 39 cm q 1 = 3.

PHY 2049: Physics II n n Capacitors: A device to hold charge. It is

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PHY 2049: Physics II n n Tutoring Center is open in room NPB 1215, M-F 12: 00 AM -4: 00 PM. It is free. Hopefully all homework problems have been solved. Please see me immediately after the class if there is still an issue.

PHY 2049: Physics II n About bicycle riding: If some one shows you a trick, it means that, n n 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.

PHY 2049: Physics II What have we learned n Coulomb’s law, electric field, Gauss’ theorem and electric potential. n All comes together in the concept of a capacitor. Capacitor: A device to store charge.

PHY 2049: Physics II

PHY 2049: Physics II • Calculate the Electric Field at P • Calculate the el. potential at P

PHY 2049: Physics II • Point charge • Distribution of charges • Line charge at an edge • Disc on an axis through the center

PHY 2049: Class Quiz If 500 J of work are required to carry a charged particle between two points with a potential difference of 20 V, the magnitude of the charge on the particle is: A. 0: 040 C B. 12: 5 C C. 20 C D. cannot be computed unless the path is given E. none of these

Some old business: What is the electric field of a shell of a uniform spherical charge distribution? What is the potential for each of the above?

PHY 2049: Physics II n E R V r The potential of a uniform spherical charge. n V Some old business Calculate electric field, integrate it to get the potential

n n n Two particles with charges Q and -Q are fixed at the vertices of an equilateral triangle with sides of length a. The work required to move a particle with charge q from the other vertex to the center of the line joining the fixed particles is: A. 0 B. k. Qq/a C. k. Qq/a 2 D. 2 k. Qq/a E. 1. 4 k. Qq/a

PHY 2049: Physics II n n n a= 39 cm q 1 = 3. 4 p. C q 2 = 6 p. C E at the center? What is the potential at the center?

PHY 2049: Physics II n n Capacitors: A device to hold charge. It is held by Coulomb force between the charges. +q and –q on two separate places. V : potential difference: q= CV C: capacitance units farad.

PHY 2049: Physics II