Real-Life Examples of Positive and Negative Electric Charge

📚 Quick Study Guide

• ⚛️ Atoms are made of protons (positive charge), neutrons (no charge), and electrons (negative charge).
• ⚖️ An object is neutral if it has an equal number of protons and electrons.
• ➕ An object becomes positively charged if it loses electrons.
• ➖ An object becomes negatively charged if it gains electrons.
• ⚡ The unit of electric charge is the Coulomb (C).
• 💡 Like charges repel; opposite charges attract.
• 📏 Coulomb's Law: The force between two charges is given by $F = k \frac{|q_1 q_2|}{r^2}$, where $k$ is Coulomb's constant, $q_1$ and $q_2$ are the magnitudes of the charges, and $r$ is the distance between them.

🧪 Practice Quiz

1. Which of the following particles carries a positive electric charge?
   1. A) Electron
   2. B) Neutron
   3. C) Proton
   4. D) Positron
2. What happens when an object gains electrons?
   1. A) It becomes positively charged.
   2. B) It becomes negatively charged.
   3. C) It remains neutral.
   4. D) It loses its charge.
3. Which of the following is an example of an object gaining a negative charge through friction?
   1. A) Rubbing glass with silk
   2. B) Rubbing amber with fur
   3. C) Touching a metal rod
   4. D) Grounding a charged object
4. If two objects have the same negative charge, what will happen when they are brought close together?
   1. A) They will attract each other.
   2. B) They will repel each other.
   3. C) They will have no effect on each other.
   4. D) They will neutralize each other.
5. What is the unit of electric charge?
   1. A) Ampere
   2. B) Volt
   3. C) Ohm
   4. D) Coulomb
6. According to Coulomb's Law, what happens to the electric force if the distance between two charges doubles?
   1. A) It doubles.
   2. B) It halves.
   3. C) It quadruples.
   4. D) It is reduced to one-fourth.
7. Which of the following best describes a neutral atom?
   1. A) It has more protons than electrons.
   2. B) It has more electrons than protons.
   3. C) It has an equal number of protons and electrons.
   4. D) It has no protons or electrons.