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

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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