chapter 21
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/1.jpg)
An electric force of4.5 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.
![Page 2: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/2.jpg)
Chapter 21Electric Fields
![Page 3: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/3.jpg)
Electric force like gravitational force is
inversely proportioned to the square of the
distance between the two points of concern
![Page 4: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/4.jpg)
Electric Field (E)•A vector quantity that relates the force exerted
on a charge to the amount of the charge
![Page 5: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/5.jpg)
Electric Field (E)
E =Fon q
q
![Page 6: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/6.jpg)
Electric Field (E)
Fon q = qE
![Page 7: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/7.jpg)
Calculate the electric field strength when a 25 N force is exerted on a charge of + 5.0 x
10-6 C
![Page 8: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/8.jpg)
Typical Field Strengths
Field Value (N/C)TV tube 1 x 105
Spark r 3 x 106
H orbital 5 x 1011
![Page 9: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/9.jpg)
Electric Field Lines
•Lines representing the force vectors in
an electric field
![Page 10: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/10.jpg)
Electric Field Lines
+
![Page 11: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/11.jpg)
Electric Field Lines
-
![Page 12: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/12.jpg)
+ -
Electric Field Lines
![Page 13: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/13.jpg)
Electric Field Lines
•Always point from positive to
negative
![Page 14: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/14.jpg)
Electric Field Lines
•Do not exist , but provide a model
of a field
![Page 15: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/15.jpg)
The electric field between two
parallel plates is uniform
![Page 16: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/16.jpg)
+ -
![Page 17: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/17.jpg)
Electric Potential•The electric
potential difference of charges
measured in volts
![Page 18: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/18.jpg)
Electric Potential•As with heat, we can only measure
potential difference (V)
![Page 19: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/19.jpg)
Electric PotentialDifference (V)•The change in potential energy per unit charge
![Page 20: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/20.jpg)
Electric PotentialDifference (V)•The work done moving a charge
thru a field charge
![Page 21: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/21.jpg)
Electric PotentialDifference (V)
•Measured in J/C
•J/C = volt (V)
![Page 22: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/22.jpg)
Electric PotentialDifference (V)
W on q
qV =
![Page 23: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/23.jpg)
Electric PotentialDifference (V)
U = W
![Page 24: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/24.jpg)
Electric PotentialDifference (V)
Uq
qV =
![Page 25: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/25.jpg)
Electric PotentialDifference (V)
W on q
qV =
![Page 26: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/26.jpg)
Electric PotentialDifference (V)
W = Fd
![Page 27: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/27.jpg)
Electric PotentialDifference (V)
Fd on q
qV =
![Page 28: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/28.jpg)
Electric PotentialDifference (V)
F
qV = x d
![Page 29: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/29.jpg)
Electric PotentialDifference (V)
F
qE =
![Page 30: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/30.jpg)
Electric PotentialDifference (V)
V = Ed
![Page 31: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/31.jpg)
Basic Equations•V = Ed•W = qV•F = qE
![Page 32: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/32.jpg)
Equipotential
•When the electric potential
difference is 0
![Page 33: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/33.jpg)
Equipotential
•Charge rearranges itself to reach equipotential
![Page 34: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/34.jpg)
Equipotential•When two spheres have
the same charge, the larger one has lower
electric potential
![Page 35: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/35.jpg)
Equipotential•When two spheres have
the same electric potential, the larger one has the greater charge
![Page 36: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/36.jpg)
Equipotential•When a charged object comes in contact with a
neutral one, the charge is
equally distributed
![Page 37: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/37.jpg)
Equipotential•Because of the size of
Earth, when objects touch Earth, their charge
is passed to the Earth
![Page 38: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/38.jpg)
Grounding•When a charged object
touches Earth, all its charge flows to Earth creating equipotential
![Page 39: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/39.jpg)
Electric Fields
•All charges are on the outside of a conductor
![Page 40: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/40.jpg)
Electric Fields
•In pointed object, the field strength is
greatest at the point
![Page 41: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/41.jpg)
Capacitor
•A device designed to store a charge
![Page 42: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/42.jpg)
Capacitance
•The ratio of charge to electric potential
difference
![Page 43: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/43.jpg)
Capacitance (C)
C =
qV
![Page 44: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/44.jpg)
Farad (F)
•Unit for capacitance measured in coulombs
per volt: F = C/V
![Page 45: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/45.jpg)
Basic Equations•V = Ed•W = qV•F = qE•q = CV
![Page 46: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/46.jpg)
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 m. Calculate: V, E, F, & W
![Page 47: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/47.jpg)
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
![Page 48: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/48.jpg)
A charge of 3.2 x 10-4 C is stored to create a
capacitance of 8.0 mF acting over 4.0
m. Calculate: V, E, F, & W
![Page 49: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/49.jpg)
Charge =1.6 x 10-6 CForce = 3.2 x 10-3 NDistance = 64 nm.
Calculate: V, E, C, & W
![Page 50: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/50.jpg)
Calculate: 3.2 x 10-144
x 1.5 x 10162
8.0 x 10-256 7.5 x 10175
x 4.0 x 10122 =
![Page 51: Chapter 21](https://reader035.vdocument.in/reader035/viewer/2022062409/56814723550346895db45950/html5/thumbnails/51.jpg)
Calculate: 3.2 x 10144
x 1.5 x 10162
8.0 x 10-254 7.5 x 10-175
x 2.0 x 10125 =