Electric Fields

# Electric Fields - Physics 202 Thursday Announcements...

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Physics 202 Thursday, January 21, 1999 Announcements: Physics Learning Resource Center 201 Osmond LAb Sunday: 8-10 pm Monday : 2:30-4:30 pm and 6-9 pm Tuesday: 2:30- 4:30 pm and 6- 10 pm Wednesday: 2:30 - 4:30 pm and 6- 10 pm Thursday: 6- 10 pm 202 Instructors will be available on Sunday and Monday Evenings! Lecture notes: Electric Fields Coulomb's law tells us what the force is acting between two specific charges If we are interested in knowing the of q 1 on a charge q 3 , at a different position, then we have to start from scratch. It is convenient to "map" out the "force per unit charge" due to charge q 1 , at all displacement from q 1 ; This is called the electric field due to q 1 . o To do this, we " imagine a test charge q o , that is positive and very small and calculate the electrostatic force between q 1 and q o as we move q o around. o q o is very small so that it does not distort what is going on near q 1 o F 1o = F = 1 q1qo 4 πε o r 2

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What is the electrostatic force due to q 1 on q 3 ?
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