2. Do Now (and then quiz on Coulomb’s law) Two charges +5C and -8C are placed 4m apart. Calculate the force they exert on each other
If you can solve this problem and the next you, you will ace the quiz!
Consider this a quick review

3. Do Now (and then quiz on Coulomb’s law) Two charges +5C and -8C are placed 4m apart. Calculate the force they exert on each other

4. The force of attraction between two charges is 30N
The force of attraction between two charges is 30N. If one of the charges is +2x10-4C, how much should the second charge be to feel that force at 3m?

5. Quiz now. You have 10 mins You are allowed to refer your notes
Do not refer to your neighbor’s paper though
No copying, no talking, no communication with anybody through any means

6. Yesterday we calculated problems using Coulomb’s law
Today we apply the concept of the law to solve problems

7. Coulomb’s law states that the force between two charges…
Is directly proportional to the amount of charge
Is inversely proportional to the square of the distance between the charges

8. Coulomb’s law states that the force between two charges…
Is directly proportional to the amount of charge
When the charge increases, force increases by the same amount
When the charge decreases, force decreases by the same amount
Is inversely proportional to the square of the distance between the charges

9. Coulomb’s law states that the force between two charges…
Is directly proportional to the amount of charge
Is inversely proportional to the square of the distance between the charges
When distance increases, force decreases by square of the distance
When distance decreases, force increases by square of the distance

10. The force between two charges is 12N
The force between two charges is 12N. What will the new force be if one of the charges was doubled?

11. The force between two charges is 9N
The force between two charges is 9N. What will the new force be if one of the charges was doubled and the other charge was tripled?

12. The force between two charges is 500N
The force between two charges is 500N. What will the new force be if one of the charges reduced by a quarter?

13. Two charges exert a force on each other
Two charges exert a force on each other. What will the new force change to if both charges are doubled?
It will increase 2x
It will decrease 2x
It will increase 4x
It will decrease 4x

14. The force between two charges is 100N
The force between two charges is 100N. What will the new force be if the distance is doubled?

15. The force between two charges is 360N
The force between two charges is 360N. What will the new force be if the distance between the charges was tripled?

16. The force between two charges is 200N
The force between two charges is 200N. What will the new force be if the distance between the charges is reduced by half?

17. The force between two charges is 180N
The force between two charges is 180N. What will the new force be if one of the charges was increase 5 times and the distance was increased 3 times?

18. Two charges exert a force on each other
Two charges exert a force on each other. What is the change in the new force if the distance is tripled? 3 9
1/3
1/9

20. The force between two charges is 12 N Solve and show your work!
YOU MUST SCORE 100 POINTS!
20 POINTS
The force between two charges is 12 N
40 POINTS
Solve and show your work!
The distance is tripled
A negative charge of C and a positive charge of 8.0 C are separated by 65 m. What is the force between the two?
The charge on both charges are quadrupled
A negative charge of -2 x 1023 C and a positive charge of 7.5 C are separated by 17 m. What is the force between the two?
The charge on one of them is doubled
Two negative charges that are both C push each other apart with a force of 29.2 N. How far apart are the two charges?