Copyright DR JJ,FSG, UiTM 1 Electricity Lecture Electricity Lecture Series Series email: [email protected]email: [email protected][email protected]; [email protected]; http://www3.uitm.edu.my/staff/drjj/ http://www3.uitm.edu.my/staff/drjj/ Applied Sciences Education Research Group (ASERG) Faculty of Applied Sciences Universiti Teknologi MARA Electric Force & Electric Force & Electric Field Electric Field
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Copyright DR JJ,FSG, UiTM 1
Electricity Lecture SeriesElectricity Lecture Series
Faculty of Applied SciencesUniversiti Teknologi MARA
Electric Force & Electric Force & Electric FieldElectric Field
Copyright DR JJ,FSG, UiTM 2
Charges, charging, electrical force & discharging
Copyright DR JJ,FSG, UiTM 3
Charges, charging, electrical force & discharging
Copyright DR JJ,FSG, UiTM 4
Charge Conservation
A5q
B-3q
A2q
B0q
Aq
Bq
A5q
B-3q
C3q
Shown are conducting spheres each of charges 5q, -3q and 5q
What is the total charge on the spheres?
Sphere A touches sphere B and then separated.
After the process above, what is the total charge & the charge on each individual sphere?
Copyright DR JJ,FSG, UiTM 5
Charge Conservation
Bq
C3q
B2q
C2q
Aq
Bq
C3q
Shown are conducting spheres each of charges 5q, -3q and 5q
Sphere B touches sphere C and then separated.
After the process above, what is the total charge & the charge on each individual sphere?
What is the total charge on the spheres?
Copyright DR JJ,FSG, UiTM 6
Charge Conservation
A7q
B-3q
A4q
B0q
A2q
B2q
A7q
B-3q
C-4q
Shown are conducting spheres each of charges 7q, -3q and -4q
What is the total charge on the spheres?
Sphere A touches sphere B and then separated.
After the process above, what is the total charge & the charge on each individual sphere?
Copyright DR JJ,FSG, UiTM 7
Charge Conservation
B2q
C-4q
B0q
C-2q
A2q
B2q
C-4q
Shown are conducting spheres each of charges 2q, 2q and -4q
Sphere B touches sphere C and then separated.
After the process above, what is the total charge & the charge on each individual sphere?
What is the total charge on the spheres?
A-q
B-q
Copyright DR JJ,FSG, UiTM 8
PHY407Lecture 2:Electrical force & Electrical Field
Why do things fall to the ground???
The gravitational field surrounding a clump of mass such as the earth. On earth, the gravitational field is g=F/mt where mt is the objects’s mass.
E
Objects don’t fall, but are attracted to the center of the earth due to he presence of gravitational field, g
Copyright DR JJ,FSG, UiTM 9
PHY407Lecture 2:Electrical force & Electrical Field
Why do things fall to the ground???
The gravitational fields of the earth and moon superpose. Note how the fields cancel at one point, and how there is no boundary between the interpenetrating fields surrounding the two bodies
E
Copyright DR JJ,FSG, UiTM 10
2.1 Electrons falling into protonReference: Physics 2000-force
2.2 Forces on chargesReference: PHET electric field hockey
2.3 Addition of forces: PHET vector addition
2.4 Electric field Reference: PHET charges & field
PHY407Lecture 2: Introduction
Activity 1-Electrical (Coulomb) Force
Activity 2-Resultant Force Activity 3-Electric Field