{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Class4HO

# Class4HO - Class 4 The Electric Field and the Electric...

This preview shows pages 1–12. Sign up to view the full content.

Class 4 The Electric Field and the Electric Potential Physics 106 Fall 2011 Press CTRL-L to view as a slide show.

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

View Full Document
Learning Outcomes from Last Time You should be able to describe the following: I the nature of forces I charging by conduction and induction I Coulomb’s law - the force between point charges I how to use Coulomb’s law
Learning Outcomes After today’s class, you should know the following items: I The electric field is defined by E = F / q 0 I The electric field points in the direction of the force on a small positive test charge I The electric field can be described by electric field lines I The electric field vector, ~ E , is tangent to the electric field lines at each point I Field lines are closer together where the field is stronger I Be able to draw the electric fields of simple arrangements of charges. I Know the characteristics of electric fields near conductors I Work standard problems involving the electric field.

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

View Full Document
The Electric Field
What is a Field? I A field is a function defined at every point in a region of space. I If a scalar is defined at every point, the field is a "scalar field" I If a vector is defined at every point, the field is "vector field"

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

View Full Document
Gravitational Field I How can you tell there is a gravitational field in this room? I Write down a fact about the gravitational field. I The force on an eraser is F = G M earth m eraser R 2 I Can you define the gravitational field of the earth at the position of the eraser?
Electric Field I We say that charges produce an electric field in a region of space. I What does this mean? I The electric field is defined in terms of the force experienced by a small test charge in this region.

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

View Full Document
Electric Field I Q produces an electric field I A small test charge, q o , placed in the field, will experience a force
Electric Field I The force depends on the charges and the distance between the charges.

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

View Full Document
Electric Field F = k e Qq 0 r 2 F = q 0 k e Q r 2 I q 0 depends on the test charge I k e Q / r 2 depends on the source and r I k e Q / r 2 is called the electric field
Electric Field I Mathematically, E = F q 0 = k e Q r 2 for a point charge I SI units are N/C or volts/meter I The electric field is a vector quantity I The direction of the field at a point is the direction of the electric force on a positive test charge placed at that point

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 63

Class4HO - Class 4 The Electric Field and the Electric...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online