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PHYS 1070 Lecture Notes - Lecture 28: Vacuum Permittivity, Electric Field

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cerisegiraffe538
25 Mar 2015
School
University of Guelph
Department
Physics
Course
PHYS 1070
Professor
Carl Svensson

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Document Summary

Phys1070: intro physics for life sci - lecture 28: electric forces. Coulomb"s law = |-->f| (vector f) = k|q1q1| / kr2. The charges q1 and q2 are measured in units of coulombs ( c) The charge of an electron is -e. The charge of a proton is +e. The charge of e=1. 60 x 10-19 c. Force is a vector with both a magnitude and a direction. The forces 2 charges exert on each are always equal in magnitude but opposite in direction. The strength of the electric force is determined by coulomb"s constant k. K is called the electric constant and is a property of the medium in which the charges reside. K = exactly 1 in a vacuum, and 1. 0005 in air, and 80 in water. The medium reduces or screens the electric force between charges. Consider an electron and a proton separated by 1 cm in a vacuum. Where g is a constant = 6. 67x10-11 nm2kg2.

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

two point charges are distanced d=47.5cm apart, they haveequal and opposite charge each with magnitude Q=6.11 µC. Thenegative charge is on the left, and the positive on the right. Anelectron (mass 9.11e-31kg, charge 1.6e-19C is placed halfwaybetween the charges.
a)The electric field at this point is?
b)The direction of the electric field is?
c)The force on the electron is?
To find a, I did E=F/q and got 2.69e19 N/C and it'swrong
for b, I chose to the right, toward the positive charge, andit's wrong
for c, I did F=Eq and I got 3.856e-14N and it's wrong
What am I doing wrong?

(A) What is the magnitude of the net electric force on charge A in the figure? Assume that q 1 = 0.70 n C and q 2 = 4.0 n C .

(B) What is the direction of the net electric force on charge A?

in a uniform electric field, the field lines are straight, parallel, and uniformly spaced.

 

Ques:

Which of the following statements are true?

Check all that apply.

1. -In a uniform electric field, the field lines are straight, parallel, and uniformly spaced.

2. -Electric field lines near positive point charges radiate outward.

3. -The electric force acting on a point charge is proportional to the magnitude of the point charge.

4. The electric field created by a point charge is constant throughout space.

5. -Electric field lines near negative point charges circle clockwise.