PHY 2049 Physics II n n n Tutoring
- Slides: 17
PHY 2049: Physics II n 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. Exam I is on Friday May 30, 2008. It will be here in class during class time.
PHY 2049: Physics II An outline n Capacitors, plate, coaxial, spherical. . n Energy, Dielectric strength, Dielectric constant. n Netweorks: Parallel and Series configuration.
PHY 2049: Physics II
Potential near a sheet charge
Potential near a sheet charge
PHY 2049: Physics II
PHY 2049: Physics II
PHY 2049: Physics II
PHY 2049: Physics II n What is the capacitance of various familiar balls. C = 4πεo. R = 10 -10 R(m) F n n n Basketball-it is an insulator Van de Graff top Earth (radius 6. 4 X 106 m) n CE = 0. 71 m. F
PHY 2049: Physics II Energy stored in a capacitor U = ½ CV 2 = Q 2/2 C = ½ QV n Dielectric Strength (oops I burned/broke it) n Capacitor Enhancement by inserting a dielectric: n n Replace εo by κεo
PHY 2049: Physics II
PHY 2049: Physics II
PHY 2049: Physics II
PHY 2049: Physics II n n Charging and discharging of capacitors. http: //edugen. wiley. com/edugen/instructor/ main. uni
PHY 2049: Physics II 25. 20
PHY 2049: Physics II Switch closed on left, capacitor C 1 is being charged We have c 2 = c 3 = 20 μF in parallel. The equivalent capacitor is then Ceq = 40 μF. When the switch is thrown to right, the battery is disconnected, the charge is shared between the capacitors C 1 and Ceq = 40. What is the charge on old C 2 and C 3? Is your answer 40 μC? What is your answer if C 2 = 10 μF and C 3 = 30 μF?
PHY 2049: Physics II n n n All about capacitors Capacitance units Farad C = 4 π κεo R Energy stored dielectrics and strength Parallel and series elements in a network