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Chapter 21 - PowerPoint PPT Presentation


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An electric force of 4.5 x 10 -5 N is measured between two particles. One particle has a charge of 2.0 x 10 -6 C & the other has a charge of 3.0 x 10 -8 C. Calculate the distance between them. Chapter 21. Electric Fields.

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slide1

An electric force of4.5 x 10-5 N is measured between two particles. One particle has a charge of2.0 x 10-6 C & the other has a charge of 3.0 x 10-8 C. Calculate the distance between them.

chapter 21

Chapter 21

Electric Fields

slide3
Electric force like gravitational force is inversely proportioned to the square of the distance between the two points of concern
electric field e
Electric Field (E)
  • A vector quantity that relates the force exerted on a charge to the amount of the charge
typical field strengths
Typical Field Strengths

Field Value (N/C)

TV tube 1 x 105

Spark r 3 x 106

H orbital 5 x 1011

electric field lines
Electric Field Lines
  • Lines representing the force vectors in an electric field
slide13

Electric Field Lines

  • Always point from positive to negative
slide14

Electric Field Lines

  • Do not exist , but provide a model of a field
slide16

+

-

slide17

Electric Potential

  • The electric potential difference of charges measured in volts
slide18

Electric Potential

  • As with heat, we can only measure potential difference (DV)
slide19

Electric Potential

Difference (DV)

  • The change in potential energy per unit charge
slide20

Electric Potential

Difference (DV)

  • The work done moving a charge thru a field charge
slide21

Electric Potential

Difference (DV)

  • Measured in J/C
  • J/C = volt (V)
slide22

Electric Potential

Difference (DV)

W on q

q

DV =

slide23

Electric Potential

Difference (DV)

DU = W

slide24

Electric Potential

Difference (DV)

DUq

q

DV =

slide25

Electric Potential

Difference (DV)

W on q

q

DV =

slide26

Electric Potential

Difference (DV)

W = Fd

slide27

Electric Potential

Difference (DV)

Fd on q

q

DV =

slide28

Electric Potential

Difference (DV)

F

q

DV = x d

slide29

Electric Potential

Difference (DV)

F

q

E =

slide30

Electric Potential

Difference (DV)

DV = Ed

basic equations
Basic Equations
  • V = Ed
  • W = qV
  • F = qE
slide32

Equipotential

  • When the electric potential difference is 0
slide33

Equipotential

  • Charge rearranges itself to reach equipotential
slide34

Equipotential

  • When two spheres have the same charge, the larger one has lower electric potential
slide35

Equipotential

  • When two spheres have the same electric potential, the larger one has the greater charge
slide36

Equipotential

  • When a charged object comes in contact with a neutral one, the charge is
  • equally distributed
slide37

Equipotential

  • Because of the size of Earth, when objects touch Earth, their charge is passed to the Earth
slide38

Grounding

  • When a charged object touches Earth, all its charge flows to Earth creating equipotential
slide39

Electric Fields

  • All charges are on the outside of a conductor
slide40

Electric Fields

  • In pointed object, the field strength is greatest at the point
slide41

Capacitor

  • A device designed to store a charge
slide42

Capacitance

  • The ratio of charge to electric potential difference
slide44

Farad (F)

  • Unit for capacitance measured in coulombs per volt: F = C/V
slide45

Basic Equations

  • V = Ed
  • W = qV
  • F = qE
  • q = CV
slide46
A charge of 1.6 x 10-6 C is stored to create a capacitance of 4.0 x 10-3 F acting over 2.0 mm. Calculate: V, E, F, & W
slide47

A charge of 1.5 x 10-6 C is stored to create a capacitance of 4.0 x 10-3 F acting over 2.0 mm. Calculate: V, E, F, & W

slide48

A charge of 3.2 x 10-4 C is stored to create a capacitance of 8.0 mF acting over 4.0 mm. Calculate: V, E, F, & W

slide49

Charge =1.6 x 10-6 C

Force = 3.2 x 10-3 N

Distance = 64 nm. Calculate: V, E, C, & W