PHYS 212 Chapter 26: 26.1-26.3
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26. 1: electric field models four basic models. Charged sphere infinitely long charged wire infinitely wide charged plane. (cid:1870) = (cid:1873)(cid:1866)(cid:1872) (cid:1874)(cid:1857)(cid:1872)(cid:1867)(cid:1870) (cid:1868)(cid:1867)(cid:1866)(cid:1872)(cid:1866)(cid:1859) (cid:1875) (cid:1858)(cid:1870)(cid:1867)(cid:1865) (cid:1869); (cid:2868)=8. 85 (cid:883)(cid:882) (cid:2869)(cid:2870) (cid:2870)/(cid:1865)(cid:2870) the net electric field due to a group of point charges is the sum of all electric fields typical field strengths. Objects charged by rubbing: 103 - 106. Sparks in the air: 3 x 106 inside an atom: 1011. Net electric field is the sum of all electric fields. A dipole is a group of two equal, opposite charges separated by a small distance. Permanent electric dipoles (like water molecules) maintain the miniscule separation induced electric dipoles are created by polarizing a neutral atom. Dipoles have zero net charge but have an electric field the distance the electric field of a dipole is observed from is often much larger than the distance between the two charges of the dipole.
