1. Chapter 7: Electric
7.1 Analysing electric fields and charge
flow

2. Matter is made up of tiny particles called atoms

3. An atom consists of..
Nucleus
- -
Neutrons
Neutral charged
+
+ Protons
+ Positive charged
- +
+
+
+
- - Electrons
Negative charged
- -

4. Electric charge:
C

5. Electron
Proton
-1.6 x 10
1.6 x 10-19 C
-19 C

6. A body is:
-
Negatively Charged
N
Neutral
+
Positively Charged
- - - + - + -
+ +
+ +
-
+
+ +
- - + +
- + +
+ +
- - - - - -
More negative Equal negative and More positive
charge than positive positive charge charge than
negative

7. Forces acting on two bodies:
Same
Net
Charges
-- Repel
++
Different
Net
Charges
- + +
Attract
-
The force causes movement of electrons
or flow of charges

8. Electric Current
Q
I =
t

9. Electric Field
An electric field is a region in which an electric
charge experiences an electric force (attraction
or repulsion)

10. Electric Field
Created from a positively charged
sphere in the spaces surrounding it
+ Attractive
Force
-
A negative charged body when placed
at any point in this region is pulled
towards the charged sphere

11. Electric Field
Represented by series of arrowed lines
+ -
Electric field lines

12. Electric Field Lines
indicate both:
-
Direction of the
+ force acting on a
charged body
placed at that
point

13. Electric Field Lines
Never cross each other
+ +

14. Electric Field Lines
Electric field lines are most dense around objects with
greatest amount of charge
+ +
Less Dense More Dense
Less Charge More Charge

15. Photo credits
• Flickr/magnifier test coil/tesla1000
• Flickr/phenomena/amsterdam today
• Flickr/I hope mom doesn’t see
this/tayyywilson
• Flickr/rural electricity/kevin dooley
• Flickr/green wheat/bernat casero