Electric field Difference between Electrostatics and Electrodynamics . . . I have been pondering on the behavior of the E field in conductors In electrostatics (where the charges are not moving): a) Electric fields are time- independent but position-dependent b) Electric fields are always zero inside a charged or uncharged conductor At the conductor surface, the E field is nonzero and perpendicular to the surface
Is Gravity Just the Electrostatic Force? • Physics Forums It's pretty easy to disprove this idea, even on the level of Newtonian gravity: First of all the sources of the electrostatic field are charge distributions at rest, those of the gravitational field are mass distributions, and in electrostatics like-sign charges repell, while the always positive (i e , like-sign) masses attract each other The deeper reason comes of course from relativity
Dielectric Cylinder Polarization (Electrostatics) - Physics Forums Homework Statement An infinitely long dielectric cylinder with radius R and relative permittivity ##\\epsilon_r## contains a free charge density given by: ##\\rho(s)= ks## for sR, where k is a constant Find the polarization P and any volume or surface polarization charge densities Homework
Why is the separation vector this (electrostatics): The discussion centers on understanding the separation vector between a point charge and a test charge in electrostatics, represented as the difference between their position vectors, π → = r → ′ r → There is confusion regarding the notation and the relationship between the vectors and their magnitudes, particularly how to derive the length of the separation vector It is clarified
Separation of Variables to Laplaces Equation in Electrostatics The discussion focuses on the application of separation of variables to solve Laplace's equation in electrostatics, emphasizing the importance of clarity in mathematical notation Participants highlight the need for using LaTeX for better readability and quoting capabilities A specific question regarding the potential at the center is noted as unanswered, indicating a gap in the solution
Electrostatics: Work required to assemble point charges I'm studying for the physics GRE and am fairly poor with EM 1 Homework Statement What is the work needed to assemble four point charges q into a regular tetrahedron of side length a? Homework Equations W = 1 2ΣqiV(ri) The Attempt at a Solution Assume that the origin is at one of the
Electrostatics and aluminium foil problem • Physics Forums 1' after a metal rod rubbing with a cloth, is the metal rod remains neutral in charge whereas the cloth will be positive charge? 2' a small pieces of paper and aluminium foil are attracted by charged metal rods when the rods are brought close to them however, the former stick to the rod