Charge, conductors, insulators and semiconductors

Answer Key - Grade 11 Science Worksheet - Building Confidence

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

1. 1.

   Two identical metal spheres on insulating stands carry 6 nC and -2 nC. They touch and are pulled apart. What charge does each carry now, Ari?

   2 nC
2. 2.

   Two identical metal spheres on insulating stands carry -9 nC and 5 nC. They touch and are pulled apart. What charge does each carry now, Bo?

   -2 nC
3. 3.

   Two identical metal spheres on insulating stands carry 10 nC and -4 nC. They touch and are pulled apart. What charge does each carry now, Esme?

   3 nC

4. Read this first

   Use this

   (example data); rubbed on a.

6. 4.

   In the diagram, what charge does the wool cloth have, Kira?

   • Positive
   • No charge
   • Negative
7. 5.

   In the diagram, what is the total charge of the balloon and cloth together, Luz?

   Use the picture in question 4.

   • 12 plus
   • 6 minus
   • Zero
8. 6.

   Is a copper wire a conductor, an insulator or a semiconductor, Milo?

   • Insulator
   • Conductor
   • Semiconductor
9. 7.

   Is pure silicon a conductor, an insulator or a semiconductor, Pia?

   • Insulator
   • Conductor
   • Semiconductor
10. 8.

    Two balloons are both rubbed on wool and become negative. What do they do when hung near each other, Ren?

    • Nothing happens
    • Push apart
    • Pull together
11. 9.

    A negative balloon is held near the positive wool cloth. What happens, Tala?

    • They pull together
    • They trade places
    • They push apart
12. 10.

    Why does a charged balloon stick to a wall that has no overall charge, Zee?

    • Air pushes the balloon onto the wall
    • The wall is negative
    • It shifts the wall's charges, so the near side attracts it