Charge, conductors, insulators and semiconductors

Answer Key - Grade 11 Science Worksheet - Challenge Me

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

1. 1.

   Identical metal spheres A, B and C carry 16 nC, 0 nC and 4 nC. A touches B, then B touches C. What charge does C carry at the end, Bo?

   6 nC
2. 2.

   Identical metal spheres A, B and C carry -10 nC, 0 nC and 3 nC. A touches B, then B touches C. What charge does C carry at the end, Esme?

   -1 nC
3. 3.

   Paper strips taped to a charged Van de Graaff dome stand up and spread out. Why, Jun?

   • They carry unlike charges and attract
   • Air blows them up
   • They carry like charges and repel
4. 4.

   Why does charge spread over the outside of a Van de Graaff's metal dome, Kira?

   • Charge sticks to one spot
   • Like charges spread apart
   • The metal soaks the charge inside
5. 5.

   A grounded metal sphere on a stick is brought near the charged dome, and a small spark jumps. What does the spark carry, Luz?

   • Light from inside the dome
   • Protons from the dome
   • Charge jumping the gap
6. 6.

   Noah says wool turns positive because protons flow into it from the balloon. Agree or disagree?

   • Disagree: the wool lost electrons
   • Agree: protons flow toward wool
   • Agree: wool makes protons
7. 7.

   Pia says rubbing a balloon creates new charge. Agree or disagree?

   • Disagree: it only moves charge around
   • Agree: friction makes charge
   • Agree: the balloon makes electrons
8. 8.

   Three objects carry +5 nC, −3 nC and 0 nC. They touch, then separate. What is their total charge afterward, Ren?

   • +8 nC
   • 0 nC
   • +2 nC
9. 9.

   A neutral comb and a neutral cloth are rubbed together, and the comb ends with −4 nC. What charge does the cloth have, Tala?

   • 0 nC
   • −4 nC
   • +4 nC
10. 10.

    What does it mean for an object to be neutral, Zee?

    • Equal protons and electrons
    • It has more neutrons than protons
    • It has no charged particles inside it