BrainTok
ENESIT

Physics II (Electricity and Magnetism): Electric charge and Coulomb's law · Properties of Electric Charge

What electric charge is, how objects become charged, and why charge is always conserved and comes in whole units.

Physics II (Electricity and Magnetism) · 23 questions

Try 3 questions

1. Rubbing a balloon on your hair leaves the balloon negatively charged. What actually moved?

  1. Electrons moved from hair to balloon
  2. Charge was created in the balloon
  3. Protons moved from balloon to hair
Show the answer

Answer: Electrons moved from hair to balloon

Rubbing transfers loosely held electrons; the balloon gains them and the hair is left with an equal positive charge.

2. Why is it almost always electrons, not protons, that move when solids become charged?

  1. Protons are locked inside atomic nuclei
  2. Electrons are heavier and move more
  3. Protons carry far less charge
Show the answer

Answer: Protons are locked inside atomic nuclei

Protons sit in nuclei held by the strong force, while outer electrons are loosely bound and can be transferred.

3. A glass rod rubbed with silk gains a charge of +3 nC. What charge does the silk end up with?

  1. -3 nC
  2. +3 nC
  3. 0 nC
Show the answer

Answer: -3 nC

Charge is conserved: the electrons the rod lost went to the silk, so the silk carries an equal and opposite charge.

The rest of the quiz, a few questions at a time

BrainTok asks a few questions from quizzes like these before the apps you choose open, so your screen time turns into learning. For iPhone.

Join the beta

More Mechanical Engineering quizzes