Review 1. What have we studied? 1.1. Electrics, Magnetics and Electromagnetism 1. 2. Optics 2. Important knowledge 2.1. Electromagnetism 2.1.1. Fields 2.1.1.1. Electric field: 0 q F E = 2.1.1.2. Magnetic field: B → 2.1.2. Forces 2.1.2.1. Electrostatic force: r r q q F E ?412 210 πε=, Permittivity constant: 2 12120m N C 1085.8---???=ε 2.1.2.2. Magnetic force: B v q F B ?= Permeability constant: m/A T 10 26.1m/A T 104 670??≈??=--πμ 2.1. 3. Potential energy: app i f W W U U U =-=-=?
2.1. 3.1. C q U E 22 = :time any at capacitor the of field electric the in stored energy The 2.1. 3.2. 2 2 Li U B =:time any at ind uctor the of field magnetic the in stored energy The 2.1.4. Electric potential: q U V = 2.1.5. ??-=-=-=?f i i f s d E q W V V V 0 :difference potential E lectric 2.1.6. Laws 2.1.6.1. Coulomb’s Law: r r q q F E ?412 210 πε= 2.1.6.2. flux electric the creates :y electricit for law Gauss ,0 enc enc q q A d E →= ??ε 2.1.6. 3. 0 =??A d B :magnetism for law Gauss know) we as far (as exist not do monopoles Magnetic → 2.1.6.4. dt d s d E B Φ-=?? : law s Faraday'field electric induced create will flux magnetic Changing → 2.1.6.5. enc E i dt d s d B 00 0 μεμ+Φ=?? :induction of law s Maxwell'- Ampere field magnetic induced create will current enclosed and flux electric Changing → 2.1.7. Concepts in electric circuits 2.1.7.1. Current: dt dq i = 2.1.7.2. dA di J = :density Current