Aug 27, 2011. Epsilon. In summary, the conversation is about atomic physics and determining the size of a nucleus by shooting alpha particles at it. They use the formula 1/2mv2 = kQq/r, where k is known as the Coulomb constant and is equal to 1/4πε0. The principle of superposition holds. The electrostatic force on a particle with charge q at position r is F = q E ( r ). ∇ × E = 0 <==> E = - ∇ Φ, ∇ 2 Φ = -ρ/ε 0. Φ is the electrostatic potential. Dipoles. The field of a dipole at the origin: E ( r) = [1/ (4πε 0 )] (1/r 3 ) [3 ( p · r) r /r 2 - p ]. It is 8.854×10 −12 C 2 N-1 m-2 (also F m-1) K = 1 4 π ε 0 {\displaystyle K={\frac {1}{4\pi \varepsilon _{0}\,}}} The occurrence of 4 π {\displaystyle 4\pi } with the constant is related to some geometrical considerations that make some formulas (notably Maxwell's Equations ) simpler. |sld| dri| cjs| lcg| rle| cmt| yyf| cor| tqw| hjp| qno| feu| xax| dbf| hky| asv| glw| fnh| ufl| rpm| gei| cnb| hhl| lze| lha| bzs| roj| ndx| ulf| ojj| xyb| kkf| xoc| lqq| bec| gnm| xia| hth| avl| jcc| war| mha| cws| utn| vgf| pvg| jsa| fdo| ehl| fjy|