1. ELECTRIC FIELDS

2. TRUE OR FALSE
FALSE
The mass of an electron is zero

3. When an object gains electrons it becomes positively charged
TRUE OR FALSE
FALSE
When an object gains electrons it becomes positively charged

4. Conductors can’t become charged
TRUE OR FALSE
FALSE
Conductors can’t become charged

5. TRUE OR FALSE
Two plastic rods of the same material are charged, when held near each other they are attracted to each other
FALSE

6. Only electrons can be transferred when an object becomes charged
TRUE OR FALSE
TRUE
Only electrons can be transferred when an object becomes charged

7. VAN DE GRAAF GENERATOR

8. VAN DE GRAAFF GENERATOR
Write the following statements in the correct order to create a flow chart:
Electrons are transferred from the belt to the metal dome
Initially, there is neutral charge everywhere
Each strand of hair has a negative charge
The belt is turned
Her hair sticks up
The dome becomes negatively charged
Electrons are stripped from the iron wool to the belt
The electrons flow from the dome, through the girl to her hair
Like charges repel so each strand tries to get away from the others
Now answer the following questions in your book:
1. Why does the girl stand in a plastic tray?
2. What will happen if someone shakes her hand? Why?
Answer:
b, d, g, a, f, h, c, i, e

9. ELECTRIC FIELDS
Why do we see a spark?

10. ELECTRIC FIELDS
A current flows between the positive dome and the negative rod. The current superheats the air causing a mini bolt of lightning.

11. These are examples of radial fields.
ELECTRIC FIELDS
The arrows indicate the direction a positive charge would move in the field.
These are examples of radial fields.

12. ELECTRIC FIELDS + -

13. ELECTRIC FIELDS

14. ELECTRIC FIELDS + +

15. ELECTRIC FIELDS

16. ELECTRIC FIELDS
The arrows on the field lines always show the direction a positive charge feels a force
This is a uniform field +

17. ELECTRIC FIELDS -

18. Lightning