Name: __________________________________________________________________ Period: ___________
Coulomb’s Law Worksheet
Drawing a diagrams
1. Object 1 has a charge of +1 C and object 2 has a charge of +2 C. The two objects are separated by 1 m.
Draw a diagram with all the important information to solve Coulomb’s law and draw arrows showing the
direction of the force.
2. Object 1 has a charge of -4 C and object 2 has a charge of +2 C. The two objects are separated by 0.5 m.
Draw a diagram with all the important information to solve Coulomb’s law and draw arrows showing the
direction of the force.
3. Object 1 has a charge of -6 C and object 2 has a charge of -10 C. The two objects are separated by 0.08
m. Draw a diagram with all the important information to solve Coulomb’s law and draw arrows showing
the direction of the force.
Finding the number of electron. Show your work and remember to convert to the proper units.
4. An object has a charge of -10 C. How many electrons or how many more electrons than protons must the
object have.
5. An object has a charge of -10 mC. How many electron or how many more electrons than protons must the
object have.
6. An object has a charge of -6 mC. How many electron or how many more electrons than protons must the
object have.
Finding the number of protons. Show your work and remember to convert to the proper units.
7. An object has a charge of +5 C. How many protons or how many more protons than electrons must the
object have.
8. An object has a charge of +8 mC. How many protons or how many more protons than electrons must the
object have.
9. An object has a charge of +1000 C. How many protons or how many more protons than electrons must
the object have.
Use Coulomb’s Law to find the electrical force on the charges. Show your work and remember to convert to the
proper units.
D
10. Find the electrical force for objects A and B.
-100 C
3 cm
11. Find the electrical force for objects A and C.
+50 C
A
4 cm
+100 C
4 cm
B
12. Find the electrical force for object A and D. (Hint: Use Pythagorean Theorem to find distance)
13. Find the electrical force for objects B and C.
14. Find the electrical force for objects B and D.
15. Find the electrical force for objects C and D. (Hint: Use Pythagorean Theorem to find distance)
-20 C
C
Adjusting the charges changes the force.
16. Charge A and charge B are attracted to each other with a force of -10 N. If charge A is doubled what
would be the new force?
17. Charge A and charge B are attracted to each other with a force of -5 N. If charge A is halved and charge
B is quadrupled what would be the new force?
18. Charge A and charge B repeal each other with a force of 10 N. If charge A is doubled and charge be is
multiplied by -2 what would be the new force?
19. Charge A and charge B repeal each other with a force of 20 N. If charge A is multiplied by 1/5 and charge
B is multiplied by 1/2 what would be the new force?
20. Charge A and charge B attract each other with a force of -15 N. If charge A is multiplied by -1/3 and
charge B is multiplied by -2 what would be the new force?
Adjusting the charges distance changes the force.
21. Charge A and charge B are attracted to each other with a force of -10 N. If the distance between the
charges is doubled what would be the new force?
22. Charge A and charge B are attracted to each other with a force of -10 N. If the distance between the
charges is halved what would be the new force?
23. Charge A and charge B repel each other with a force of 20 N. If the distance between the charges is
multiplied by 10 what would be the new force?
24. Charge A and charge B repel each other with a force of 20 N. If the distance between the charges is
multiplied by 1/10 what would be the new force?
25. Charge A and charge be repel each other with a force 1 N. If charge A is multiplied by -3, charge be is
multiplied by 3, and the distance is multiplied by 3 what would be the new force?