I. The Four Fundamental Forces

# I The Four - B It is possible for an object to pick up an extra positive or negative charge The object will have the either a positive or negative

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Physics 202 Tuesday January 12 1999 Announcements: The syllabus was handed out. Lecture notes: I. The Four Fundamental Forces A. Strong Force B. Weak Force C. Gravity: covered in Phys 201 D. Electromagnetic Force: covered in 202 I. What we’ll learn in 202 A. Four Fundamental laws about electromagnetism 1. Maxwell’s equations A. Electricity and Magnetism are the basis for many phenomena 1. Electricity- lightning current 2. Radiation- light x-rays 3. Magnetism- electric motors MRI 4. Chemistry- chemical bonds reactions A. Electric Charges B. Current C. Magnetic Fields I. Electric Charge A. Two types of charges: Positive and Negative 1. Like charges repel 1. Opposite charges attract A. Atomic Structure 1. a negative electron cloud 2. nucleus of protons and uncharged neutrons

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A. All objects tend to contain equal amounts of negative and positive charges and stay electrically neutral.
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Unformatted text preview: B. It is possible for an object to pick up an extra positive or negative charge. The object will have the either a positive or negative charge depending on the extra charges C. Charges are measured in units of Coulomb (C) 1. A Coulomb is the amount of charge flow through the cross section of a wire in 1 second when there is a current of 1 ampere ( Amperes will be discussed in a later chapter) 2. The amount of charge carried by an electron is 1.6x 10 19 C A. Electrons move differently in different materials 1. Insulators- electrons move slowly Ex. Wood plastic 2. Conductors- electrons move quickly Ex. Metals 3. Semiconductors- intermediate electron motion can be manipulated A. Coulomb’s law 1. Like charges repel 2. Opposite charges attract...
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## This note was uploaded on 02/21/2008 for the course PHYS 212 taught by Professor Mahlon,gregoryda during the Spring '07 term at Pennsylvania State University, University Park.

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I The Four - B It is possible for an object to pick up an extra positive or negative charge The object will have the either a positive or negative

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