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General Physics Electricity, Magnetism, and Light

by: Bryana Greenholt

General Physics Electricity, Magnetism, and Light PHYSICS 112

Marketplace > Ohio State University > Physics 2 > PHYSICS 112 > General Physics Electricity Magnetism and Light
Bryana Greenholt
GPA 3.96

William Putikka

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William Putikka
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This 2 page Study Guide was uploaded by Bryana Greenholt on Monday September 21, 2015. The Study Guide belongs to PHYSICS 112 at Ohio State University taught by William Putikka in Fall. Since its upload, it has received 15 views. For similar materials see /class/209994/physics-112-ohio-state-university in Physics 2 at Ohio State University.

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Date Created: 09/21/15
Study Guide some things you need to know about Electrostatics Note that below the bare facts are stated Without proof You may be asked to show proofs of some statements in exams Proofs were discussed in lecture either on the blackboard or in the transparencies You can nd proofs in the lecture notes and the textbook This list is not necessarily complete Like charges repel Unlike charges attract Neutral and charged objects attract each other In a conductor charges may move around freely the charges may separate if an external electric eld is applied In an insulator charges cannot move freely they can just shift a bit leading to polarization ln electrostatics the electric eld inside a conductor is zero In electrostatics on the surface of a conductor E is perpendicular to the surface Excess charge on a conductor collects on the outside surface of the conductor By putting an object into a box made of conducting material one can protect the object from electric elds shielding In an insulator E may have any value Electric eld lines start at positive charges or in nity and end at negative charges or in nity Electric eld lines cannot cross The density of electric eld lines is proportional the magnitude of the electric eld The direction of the electric eld at a point is given by the tangent to the eld line at that point Electric potential energy and electric potential are two different physical quantities Two points connected by a conducting material are on the same potential Positive charges move towards lower potential negative charges move to wards higher potential Both positive and negative charges move towards lower PE Each point on an equipotential surface eps is on the same potential If a charge is moved from one point on an eps to another point on the same eps no net work is done Equipotential surfaces are always perpendicular to electric eld lines


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