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lecture 2

# lecture 2 - Lecture#2 Outline of this lecture Section 18.5...

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1 Lecture #2 Outline of this lecture Section 18.5: Coulomb’s Law qualitative; equation; coulomb’s law for multiple charges Section 18.6: Electric Field test charges; electric field: definition, equation; electric field from Coulomb’s Law; parallel plate capacitors In addition, we will be solving some problems in the class!

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2 18.5 Coulomb’s Law So charged objects exert forces on one another: Let’s consider two positive point charges separated by some distance r: Point charges : the charges are much smaller than the distance between them. x + + r q 1 q 2 *Since they are like charges, they repel each other, and Newton’s 3 rd Law tells us they do this with equal and opposite force. +F -F So what do we know about this force? 1. It grows weaker with distance. 2. It gets stronger for increasing charges. 3. It’s directed along the line containing the two charges. Coulomb determined that: 2 2 1 r q q k F =
3 This is Coulomb’s Law 2 2 1 r q q k F = k is a constant: 2 2 9 10 99 . 8 4 1 C m N k o × = = πε 10 8.85 2 2 12 - m N C o × = ε This is the permitivity of free space .

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lecture 2 - Lecture#2 Outline of this lecture Section 18.5...

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