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Class 021 - Electric Fields

# Class 021 - Electric Fields - Finish the first two homework...

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Coulomb’s Law & Electric Fields What You Will Learn Today What is an Electric Field? How do we use trigonometry to determine the net electric field? Preparation for next class Finish the first two homework assignments Refresh vectors/trigonometry Read Chapter 20

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Reading Quiz 1. Electric forces and fields are vectors. What are the two key characteristics of vectors? 2. For the following triangle, what is the length of the hypotenuse? 3. What are the values of sin θ, cos θ, and tan θ (specify as fractions)? θ 12 m 5 m
Electric Field Electrostatic force is a long-range force But, how do long-range forces work? Electric Field is the measure of how a charge influences or alters the space around it It can be thought of as electric force felt by a unit positive “probe” charge at any given point in space around other charge(s) Flows from positive to negative charge Electric field is a vector Unit is N/C (or V/m, as we will see later!)

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