* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Document
Survey
Document related concepts
Electromagnet wikipedia , lookup
Introduction to gauge theory wikipedia , lookup
Casimir effect wikipedia , lookup
History of quantum field theory wikipedia , lookup
Magnetic monopole wikipedia , lookup
Weightlessness wikipedia , lookup
Electromagnetism wikipedia , lookup
Fundamental interaction wikipedia , lookup
Maxwell's equations wikipedia , lookup
Aharonov–Bohm effect wikipedia , lookup
Anti-gravity wikipedia , lookup
Speed of gravity wikipedia , lookup
Mathematical formulation of the Standard Model wikipedia , lookup
Field (physics) wikipedia , lookup
Lorentz force wikipedia , lookup
Transcript
Name : 1) Abhishek Yadav 130360111001 2) Prakash Giri 130360111002 3) Kheni Niral 130360111003 4) Bhadresh Langadiya 130360111004 Branch : Electronics & Communication Faculty : 1) V.S.Kansara a) form F kq1q2 /r 2 b) Units Two possibilities: - define k and derive q (esu) - define q and derive k (SI) √ 9 10 N k(1C) /(1m) 9 2 k 9 10 N 9 2 For practical reasons, the coulomb is defined using current and magnetism giving k = 8.988 x 109 Nm2/C2 Permittivity of free space 0 Then F 1 8.84 10 12 C 2 / Nm2 4k 1 40 c) Fundamental unit of charge e = 1.602 x 10-19 C q1q2 r2 Net force is the vector sum of forces from each charge F3 q1 q2 q q3 F2 F1 Net force on q: F = F1 + F2 + F3 F - abstraction - separates cause and effect in Coulomb’s law a) Definition r r F E q0 Units: N/C b) Field due to a point charge q0 F Q r Coulomb’s law: Electric Field: r r E // F Qq0 Fk 2 r Q E F /q0 k 2 r direction is radial Net field is the vector sum of fields from each charge E3 q1 q2 P q3 E2 E1 Net field at P: E = E1 + E2 + E3 E a) Direction of force on positive charge radial for point charges out for positive (begin) in for negative (end) b) Number of lines proportional to charge Q 2Q d) Line density proportional to field strength Line density at radius r: N 1 2 2 4r r Number of lines area of sphere Lines of force model <==> inverse-square law a) dipole b) two positive charges c) Unequal charges d) Infinite plane of charge + + + + + + + + + + + q, + E A By comparison with the field from a point charge, we find: Field is uniform and constant to ∞, in both directions Electric field is proportional to the line density, and therefore to the charge density, =q/A E 2 0 e) Parallel plate capacitor compared to the size) E+ E- EL=0 + + + + E+ E- E=2E+ - + - + - • Strong uniform field between: • Field zero outside (assume separation small E+ E- ER=0 E /0 f) Spherically symmetric charge distribution • Symmetry ==> radial • number of lines prop. to charge + + + + + + + + Outside the sphere: r kq E 2 rˆ r as though all charge concentrated at the centre (like gravity)