Lecture_02

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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
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)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 27

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online