Physics » F. Electromagnetism » F.1. Electric Forces and Fields

Introduction to Electric Forces

Overview

Determining whether two charges attract or repel each other using the law of charges

Recognizing that electric charge is conserved

Recognizing that electrons are negatively charged and can move and protons are positively charged and stay in place

Separation and Transfer of Charge

Overview

Recognizing that an electric charge tends to be static on insulators and can move on and in conductors

Identifying examples of induction

Identifying examples of conduction

Predicting the effect of a charged rod on the distribution of charges in a neutral electroscope

Coulomb’s Law

Overview

Determining the effect of changing the distances between two charges or the magnitude of charges on the electrical force using Coulomb’s law, |F_E| = k (|q₁q₂|) /r²,

Solving problems involving the electric force between two charges using Coulomb’s law, |F_E| = k (|q₁q₂|) /r²

Electric Fields

Identifying the correct direction of electric field lines for one or more charges

Identifying the correct charges based on the direction of electric field lines

Solving problems involving the electric field intensity and the electric force using the equation E = F/q

Solving problems involving the electric field of a uniform electric field using the equation E = V/d

Electrical Potential

Overview

Solving problems involving the electric potential (V) using the equation ΔV = ΔU_E/q

Solving problems involving the electric potential created by a point source charge Q using the equation V = kQ/r

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