Lecture_02

# Lecture_02 - Example Problem A particle with charge +2 nC...

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A particle with charge +2 nC (1 nanoCoulomb=10 -9 C) is located at the origin. What is the electric field due to this particle at a location <-0.2,-0.2,-0.2> m? r = observed _ location source _ location r = 0.2, 0.2, 0.2 0,0,0 = 0.2, 0.2, 0.2 r = 0.2 ( ) 2 + 0.2 ( ) 2 + 0.2 ( ) 2 = 0.35 m ˆ r = r r = 0.2, 0.2, 0.2 0.35 = 0.57, 0.57, 0.57 r Solution: 1. Distance and direction : r r q E ˆ 4 1 2 1 0 1 πε = Example Problem

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C N m C C Nm 2 2 2 147 35 . 0 10 2 10 9 4 1 2 9 9 2 0 = × × = = r q E πε 2. The magnitude of the electric field : 3. The electric field in vector form : C N C N 84 , 84 , 84 57 . 0 , 57 . 0 , 57 . 0 147 ˆ = = = E r E E r r q E ˆ 4 1 2 1 0 1 = Example Problem
A penny carrying a small amount of positive charge Q p exerts an electric force F on a nickel carrying a large amount of positive charge Q n that is a distance d away (Q n > Q p ). Which one of the following is not true? A. The electric force exerted on the penny by the nickel is also equal to F . B. The number of electrons in the penny is less than the number of protons in the penny. C. , if d is small compared to the size of the coins. D. , if d is large compared to the size of the coins. F 1 4 " ε 0 Q p Q n d 2 F 1 4 " 0 Q p Q n d 2 Question 1 (Chap. 13)

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Which one of the following is not true? The electric force exerted by an electron on an electron: A. decreases by a factor of 25 if the distance is increased by a factor of 5. B. has the same magnitude as the electric force exerted by a proton on a proton at the same distance. C. has the same direction as the electric force exerted by a proton on a proton at the same distance.
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## Lecture_02 - Example Problem A particle with charge +2 nC...

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