Slide1 l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 11

Electrostatics PowerPoint PPT Presentation


  • 312 Views
  • Uploaded on
  • Presentation posted in: General

Electrostatics. Basic Structure of the Atom:. Negative Charge(-) no mass. Positive Charge(+) 1 amu. Neutral Charge(0) 1 amu. Electrostatics: Electrical charges at rest. Law of Electrostatics: Like charges repel, Unlike charges attract. Conductors: Free electrons allow conduction of charge.

Download Presentation

Electrostatics

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Slide1 l.jpg

Electrostatics

Basic Structure of the Atom:

Negative Charge(-)no mass

Positive Charge(+)1 amu

Neutral Charge(0)1 amu


Slide2 l.jpg

Electrostatics: Electrical charges at rest

Law of Electrostatics: Like charges repel, Unlike charges attract

Conductors: Free electrons allow conduction of charge

e-

metal

+

+

+

+

+

+

+

+

+

+

+

+


Slide3 l.jpg

Insulators (non-Conductors): Tightly bound electrons do not conduct charge readily

wood

No electron transfer!

+

+

+

+

+

+

Semi-Conductors: Silicon and Carbon, among others that fall in between good conductor and good insulators. Often used in computer chips and other electronics.


Slide4 l.jpg

Electroscope: Device used for detecting charges:

+

-

+

+

-

-

Coloumb’s Law: Electric Charge (Q) exerts a force that depends directly on the charges and inversely on the distance between the charges!


Slide5 l.jpg

Charge is determined by the surplus or deficiency of electrons in relation to protons and is measured in coloumbs (C)

1 C = 6.25 X 1018 electrons

This is a lot of charge-- most charges are measured in microcoloumbs (µC)

1 µC = 10-6 C

Coloumb’s Law:

k = 9 X 109 Nm 2/C2this value is for charges separated by air

kQ1Q2

r2

F =

Demo’s


Slide6 l.jpg

An electrostatic charge of 60.0 µC exerts a force of 175 N on a charge of 50.0 µC. How far apart are the charges?

Q1 = 60.0 µC

kQ1Q2

F

Q2 = 50.0 µC

r =

F = 175 N

r = ?

= (9 x 109 Nm 2/C2)(60.0 x 10-6 C)(50.0 x 10-6 C)

175 N

= .391 m


Slide7 l.jpg

Electric Field and Electric Field Intensity

Lines of Force

q

m

q

q

q

Gravitational Field

Electric Field


Slide8 l.jpg

Electric Field Lines of Force:

Electric Field Intensity (E): Force that acts on a small test charge (+) in the field

F

q

Units: N/C

E =


Slide9 l.jpg

1) Calculate the electrostatic force acting on a proton and an electron that are 1.00 x 10-10 m apart.

2) A pith ball with a charge of 6.0 µC is placed 12 cm from a second ball that is charged -4.3 µC. A) Find the magnitude of the force between them. B) Explain if this is a force of attraction or repulsion.

3) Two pith balls are charged and separate so that the angle between their threads is 20.0˚. If the mass of each ball is .15 g, what electrostatic force is acting on each ball? (FBD!)


Slide10 l.jpg

4) If the threads in the previous problem are 15.0 cm long, a) how far apart are the pith balls and b) what is the magnitude of the charge acting on the pith balls?

5) An object with a charge of 12.3 µC is acted upon by a force of 6.4 N when placed in an electric field. What is the field’s intensity at this point?

6) An electron moving through an electric field experiences an acceleration of 6.3 x 103 m/s2. A) How much electrostatic force is acting on it? B) What is the electric field intensity?


Slide11 l.jpg

Two pith balls are equally charged and separate so that the strings they hang from form an angle of 20.0˚. If the strings are 15.0 cm long, and the electrostatic charge on each ball is +0.100 µC, what must be the electrostatic force acting on each?

k = 9 X 109 Nm2/C2


  • Login