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Announcements

Announcements. Homework for tomorrow… (Ch. 25, Probs. ) PHYS 132 labs begin THIS week! Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours: ??. Chapter 25. Electric Forces & Charges. Chapter 25 Preview…. Electrostatics

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 25, Probs. ) • PHYS 132 labs beginTHIS week! • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: ??

  2. Chapter 25 Electric Forces & Charges

  3. Chapter 25 Preview… Electrostatics • Electric charges & postulates • Electric force • Electric field

  4. Charge Model: Basic Postulates • Rubbing an object either adds or removes charge. More vigorous rubbing produces a larger quantity of charge. • There are only 2 kinds of charge: positive & negative. • 2 like charges exert repulsive forces on each other. 2 opposite charges attract each other. • The force between two charges is a long-range force. The magnitude of the force… • increases as the quantity of charge increases. • decreases as the distance between the charges increases.

  5. Charge Model: Basic Postulates, continued… • Neutralobjects have an equal mixture of both positive and negative charge. The rubbing process somehow manages to separate the 2. • There are two types of materials: conductors & insulators. • Conductors are materials through or along which charge moves. • Insulators are materials on or in which charges remain fixed in place. • Charge can be transferred from 1 object to another by contact.

  6. Charge Atoms are made up of.. • Protons & neutrons (nucleus) • protons: “heavy”& positively charged • neutrons: no net charge, about same mass as protons • protons and neutrons are made up of quarks • Electrons • “light” & negatively charged • Fundamental particle, no structure, “orbits” nucleus Notice: • chargeis an inherent property of electrons and protons. • Fundamental unit of charge:

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