# Electric Fields

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## Electric Fields

Today we went over how to calculate the strength of an electric field on a test charge. (Cutnell 18.6)

Lecture number:
3
Pages:
2
Type:
Lecture Note
School:
The University of Vermont
Course:
Phys 012 - Elementary Physics
Edition:
1
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Unformatted text preview:

Lecture 3 Outline of Last Lecture II. Insulators: contain no free electrons that can move around easily a. Conduct electric charge poorly III. Coulomb’s Law: the magnitude F of te electrostatic force exerted by one point charge q1 on another point charge q2 is directly proportional to the magnitudes |q1| and |q2| of the charges and inversely proportional to the square of the distance r between them (Cutnell 535) a. F = (k |q1||q2|)/r2 b. k = proportionality constant = 8.99 x 109 (N*m2)/C2 F12 = - F21 (Newton’s 3rd Law) Σ F = ma, same mass = same a, just in different Directions (Newton’s 2nd Law) Problem: Where can a 3rd charge (q0) be placed so Fnet on it is zero? Outline of Current Lecture Physics 012 1st Edition

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