5:Electric Charges and Fields
9:Current and Resistance
11:Magnetic Forces and Fields
12:Sources of Magnetic Fields
Electric potential . Change in potential energy
▭ Electron (proton) mass = 9.11×10−31kg (1.67× 10−27kg). Electron volt: 1 eV = 1.602×10−19J
▭ Near an isolated point charge where =8.99×109 N·m/C2 is the Coulomb constant.
▭ Work done to assemble N particles
▭ Electric potential due to N charges.
. For continuous charge . For a dipole,
▭ Electric field as gradient of potential
▭ Del operatornote: Cartesian Cylindrical Spherical
= electric potential
= change in potential energy (or simply )
Electron (proton) mass = 9.11×10−31kg (1.67× 10−27kg). Elementary charge = e = 1.602×10−19C.
=kinetic energy. 1 eV = 1.602×10−19J
near isolated point charge
Many charges: .