Lecture 2 jan8

# Lecture 2 jan8 - Lecture #2 The Electric Field Qwizdom...

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Lecture #2 The Electric Field Qwizdom wireless test Session ID = 240 Login with 8 digit UMID

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Last lecture-- Coulomb’s Force Law Coulomb’s Force Law (1784) 2 kinds of charge, force on line between, inverse square law……… With k=1/(4πε o )=8.99x10 9 Nm 2 /C 2 Remember: force is a vector—we need to specify which charge we want to know the force on. Real power of Coulomb’s Law-----The principle of Superposition ... F F F F 41 31 21 1 + + + = 2 2 1 r q q k F = e=1.6 x 10 -19 C
The Electric field, 1 E T T T T T onT on on E q r r q kq F r r q kq F r r q kq F 1 2 1 1 1 1 2 13 13 3 1 3 1 2 12 12 2 1 2 1 ˆ ˆ ˆ = = = = T T 1 2 1 1 ˆ ) ( q F r r kq r E on = = + + - T In general for a point charge q 1 This is the vector field associated with q 1 : every point in space has E x , E y , and E z due to q 1 technical point: take limit as q T goes to zero 1 2 3

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Brief Interlude Qwizdom wireless test Session ID = 240 Login with 8 digit UMID (If you registered for 240 very recently you may need to input your UMID twice)
Question 1 What is your age?

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## This note was uploaded on 04/04/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Spring '08 term at University of Michigan.

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Lecture 2 jan8 - Lecture #2 The Electric Field Qwizdom...

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