EfieldsPotentialsR33

# EfieldsPotentialsR33 - The Electric Field Coulomb’s Law...

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Unformatted text preview: The Electric Field Coulomb’s Law describes a force between two charged objects. There’s another way to view the situation: 1. A charge (call it the ” source charge ”) in space creates a force field called the Elec- tric Field . 2. A second charge (call it the ” test charge ”) will feel a force due to this field . • Is this field real? Did the source charge change something about the space around it ? Yes, the space is actually changed by the source charge and contains energy due to it. 1 • What is the test charge seeing? The source charge or the field? The test charge interacts with the field. The Electric Field (continued) • The source charge ( q s ) causes an Electric Field. • The test charge ( q t ) feels the electric force ( F el ) due to this Electric Field: F el = k q s q t r 2 • The strength of the Electric field is defined as: the Force felt by the test charge divided by the test charge: E = F el q t = k q s r 2 1. How does the strength of the Electric field depend on the source charge? The field strength varies directly with the amount of source charge. 2. How does the strength of the Electric field depend on the test charge? The field strength is indepen- dent of the test charge. 3. How does the strength of the Electric field de- pend on distance from the source charge? The field strength varies inversely with the square of the dis- tance from the source charge. 4. Is the Electric Field a vector? Yes, it has a magni- tude and a direction. 2 Electric Field Lines The Electric Field is a vector: 1. Its direction at a point is the same as that of the electric force felt by a positive test charge at that point....
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## This note was uploaded on 10/19/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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EfieldsPotentialsR33 - The Electric Field Coulomb’s Law...

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