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Transcript

PHYS 2212TEST 1 ReviewSpring '08 Chapter 21-Electric charge and electric field Terms: Electric field, field lines. Coulomb's law: Electric charges exert a force on each other F k Q1Q2 k r2 1 40 Where F is force (N), r is distance (m), and Q is charge (C). F is repulsive for like charges and attractive for unlike charges. Unit of Charge: Coulombs (C). The charge on an electron is 1.6x10-19 C (There are 6.25 x1018 electrons in one coulomb of charge). Electric field: the force per unit charge that would act on a test charge q placed at a point where electric field is defined. E = F/q = kQ/r2 with the same direction of F. Understand the contributions to the electric field due to multiple charges. Understand the field lines. Chapter 22- Gauss’s Law Terms: electric flux, charge densities Electric flux E E da ; Gauss’s Law Qin E da 0 Understand different charge distributions: charge per unit length, unit area, and unit volume. Find the electric field for point charge, spherical charge, and cylindrical charge distribution. Electric field = zero inside a conductor. Chapter 23-Electric potential Terms: Electric potential energy, electric potential, voltage For two point charges: U k q1 q 2 r Work done by the electric field, W = -U b V E dl a Electric potential difference Vab: the work done to move 1 -C charge between the two points a and b; units: Volts (1V = 1 J/C) => potential energy change PE= qVab. For a uniform electric field E: Vab = Ed, where d is the distance between a and b. Electric potential due to a point charge, V k Q r Chapter 24- Capacitance and dielectrics Terms: Capacitance, energy density, dielectric constant Capacitance: C = Q/V (= 0A/d for a parallel plate capacitor) Capacitor in series: 1/C = 1/C1 + 1/C2 + 1/C3 + ….. Capacitor in parallel: C = C1 + C2 + C3 + ….. 1 1 1 Q2 Energy stored in a capacitor: U QV CV 2 2 2 2 C Energy density u = 0E2/2 Dielectric constant K = C/C0