Coulomb's law: the force between charges
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Two small spheres carry 40 nC and 40 nC. With k = 8.9875 × 10⁹ N·m²/C², how far apart in cm must they be for a force of 3.6 mN, to the nearest hundredth, Ari?
Two small spheres carry 10 nC and 90 nC. With k = 8.9875 × 10⁹ N·m²/C², how far apart in cm must they be for a force of 0.9 mN, to the nearest hundredth, Bo?
Two small spheres carry 80 nC and 50 nC. With k = 8.9875 × 10⁹ N·m²/C², how far apart in cm must they be for a force of 10 mN, to the nearest hundredth, Esme?
A positive charge sits between two equal positive charges, closer to the left one. Which way is the net force on it, Kira?
- Zero, since the charges are equal
- To the right, away from the nearer charge
- To the left, toward the nearer positive charge
Milo says a +10 nC sphere pushes harder on a +2 nC sphere than the +2 nC sphere pushes back. Agree or disagree?
- Agree: bigger charges push harder
- Disagree: the two forces are equal
- Agree: the small one barely pushes
Noah says a charged balloon pulls on a wall harder than the wall pulls on the balloon. Agree or disagree?
- Agree: the charged one pulls harder
- Agree: walls can't pull
- Disagree: they pull on each other equally
Pia says the force between two charges disappears completely once they are 1 m apart. Agree or disagree?
- Disagree: it gets weaker but isn't zero
- Agree: forces stop at 1 m
- Agree: charges can't reach that far
Both charges double, and the distance between them doubles too. What happens to the force, Ren?
- It stays the same
- It doubles
- It is 8 times as big
The distance between two charges triples. What fraction of the force is left, Tala?
- One-sixth
- One-ninth
- One-third
One charge triples, and the distance triples. What happens to the force, Zee?
- It drops to one-third
- It triples
- It stays the same