11th grade Coulomb's law: the force between charges worksheet

Coulomb's law: the force between charges

Grade 11 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Two small spheres carry 20 nC and 30 nC, 10 cm apart. With k = 8.9875 × 10⁹ N·m²/C², what is the force between them in mN, to the nearest hundredth, Ari?
2. 2.

   Two small spheres carry 100 nC and 100 nC, 20 cm apart. With k = 8.9875 × 10⁹ N·m²/C², what is the force between them in mN, to the nearest hundredth, Esme?
3. 3.

   How are Coulomb's law and Newton's law of gravitation alike, Jun?

   • Both are inverse squares of distance
   • Both use the same constant
   • Both need the objects to touch each other
4. 4.

   How do the electric and gravitational forces differ in direction, Kira?

   • They are the same
   • Gravity can repel, but electric forces can't
   • Electric forces can also repel
5. 5.

   Two balloons each carry a small charge and a small mass. Which force between them is stronger, Luz?

   • The electric force, by far
   • The gravitational force, by far
   • They are about equal
7. 6.

   Using the table, what force should act at 8 cm, Milo?

   • 9 mN
   • 2.25 mN
   • 3 mN
8. 7.

   Using the table, how does the force change from 2 cm to 6 cm, Noah?

   Use the picture in question 6.

   • It drops by 32 mN each centimeter
   • It drops to one-ninth
   • It drops to one-third
9. 8.

   Using the table's pattern, what force would act at 1 cm, Pia?

   Use the picture in question 6.

   • 144 mN
   • 72 mN
   • 37 mN
10. 9.

    Two negatively charged balloons hang on strings. What happens as they are brought closer, Ren?

    • They push apart more weakly than before
    • They push apart more strongly
    • They start to attract
11. 10.

    Two balloons are rubbed longer, so each carries more charge. How does the force between them change, Zee?

    • It stays the same
    • It gets weaker
    • It gets stronger