* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electrostatics - seniorphysicscranson
Survey
Document related concepts
Work (physics) wikipedia , lookup
History of subatomic physics wikipedia , lookup
Magnetic monopole wikipedia , lookup
Introduction to gauge theory wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Anti-gravity wikipedia , lookup
Standard Model wikipedia , lookup
Speed of gravity wikipedia , lookup
Aharonov–Bohm effect wikipedia , lookup
Maxwell's equations wikipedia , lookup
Elementary particle wikipedia , lookup
Electromagnetism wikipedia , lookup
Field (physics) wikipedia , lookup
Fundamental interaction wikipedia , lookup
Atomic theory wikipedia , lookup
Lorentz force wikipedia , lookup
Transcript
Electrostatics Static Charges and Related Electric Fields Charged Particles • Proton: – Rest mass- 1.6726 x 10-27 kg – Electric charge - 1.60 x 10-19 C • Electron: – Rest mass- 9.1094 x 10-31 kg – Electric charge - 1.60 x 10-19 C • Neutron: – Rest mass- 1.6749 x 10-27 kg – Electric charge - 0.00 C Point Charges • Any charge that is present on the surface of any isolated sphere. – Acts as if it were located in the center of the sphere. • The same way gravity acts from the center, even though mass is all around us. • The quantity of charge at that location can be represented by “Q”, and is measured in Coulombs. • Named after Charles Augustin de Coulomb (1736-1806) Coulomb’s Law • Established proportionality between factors dealing with forces between charged particles. Q1Q2 Force k 2 d Where k = 9 x 109 Nm2/C2 Example: • Two charged particles each charged to 10-2 C are placed 10m apart. Calculate the force on them: Q1Q2 Fk 2 d 2 2 Nm (10 C) F 9x10 x 2 2 C (10m) 2 9 F 9x10 N 3 Repulsive Force Electric Fields • Exist in a region of space if an electric charge placed inside it feels a force. Field Lines • The path taken by a positive test charge within a region of space surrounding a charged particle. • The electric line of force is a line so drawn that a tangent to it at any point indicates the orientation of the electric field at that point. Electric Field Intensity • The electric field intensity is proportional to the number of lines of force per unit area normal to the field. • High intensity = lots of lines. • Low intensity = few lines. • Also known as potential gradient. Field Intensity Equation • E = F/q • F is the force in Newtons acting on the test charge q in coulombs. Combine with Coulomb’s law, E = kQ/r2 Example: • An electrostatic charge is placed in an electric field that has an intensity of 1.50 x 105 N/C. The charge experiences a force of 2.10 N Calculate the magnitude of the charge. F = 2.10 N 1.50 x 105 N/C F 2.10N q E 1.50x10 5 N C Electric Fields Between Charges • Find “E” for each charge, add all together. ET=E1+E2+E3… Classwork Modern Physics (Holt, Rinehart, Winston) • Questions Group B(for Proficiency) – Questions #1-11 • Problems Group A Understanding) – Questions #1-11. (to show Advanced