PHY 2049: Physics II Tutoring Center is open in room NPB 1215, M-F 12:00AM -4:00PM. It is free. Hopefully all homework problems have been solved. Please.

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Presentation transcript:

PHY 2049: Physics II Tutoring Center is open in room NPB 1215, M-F 12:00AM -4:00PM. 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, It will be here in class during class time.

PHY 2049: Physics II An outline Capacitors, plate, coaxial, spherical.. Energy, Dielectric strength, Dielectric constant. Netweorks: Parallel and Series configuration.

PHY 2049: Physics II

Potential near a sheet charge

PHY 2049: Physics II

What is the capacitance of various familiar balls. C = 4 πε o R = R(m) F Basketball-it is an insulator Van de Graff top Earth (radius 6.4 X 10 6 m) C E = 0.71 mF

PHY 2049: Physics II Energy stored in a capacitor U = ½ CV 2 = Q 2 /2C = ½ QV Dielectric Strength (oops I burned/broke it) Capacitor Enhancement by inserting a dielectric: Replace ε o by κε o

PHY 2049: Physics II

Charging and discharging of capacitors. 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 C eq = 40 μF. When the switch is thrown to right, the battery is disconnected, the charge is shared between the capacitors C 1 and C eq = 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 All about capacitors Capacitance units Farad C = 4 π κε o R Energy stored dielectrics and strength Parallel and series elements in a network

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