## Questions and Answers

What is the direction of the electrostatic force between two point charges with opposite signs?

Attractive

What is the value of Coulomb's constant in SI units?

8.99 x 10^9 N m^2 C^2

What is the significance of the charge conservation principle?

The total electric charge in a closed system remains constant over time

What is the mathematical representation of the charge conservation principle?

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What is the effect of increasing the distance between two point charges on the electrostatic force between them?

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What is the direction of the electrostatic force between two point charges with the same sign?

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## Study Notes

### Electric Charge

#### Coulomb's Law

- Describes the electrostatic force between two point charges
- Mathematically represented as: F = k * (q1 * q2) / r^2
- Where:
- F is the electrostatic force between the two charges
- k is Coulomb's constant (approximately 8.99 x 10^9 N m^2 C^2)
- q1 and q2 are the magnitudes of the two point charges
- r is the distance between the centers of the two charges

- The force is:
- Attractive if the charges are opposite in sign
- Repulsive if the charges are the same sign

#### Charge Conservation

- The total electric charge in a closed system remains constant over time
- Charge cannot be created or destroyed, only transferred from one object to another
- Mathematically represented as: ΔQ = Q_final - Q_initial = 0
- Where:
- ΔQ is the change in total charge
- Q_final is the final total charge
- Q_initial is the initial total charge

- Charge conservation is a fundamental principle in physics, applicable to all physical processes

### Electric Charge

### Coulomb's Law

- Describes the electrostatic force between two point charges
- Electrostatic force (F) is directly proportional to the product of the magnitudes of the two charges (q1 and q2)
- Electrostatic force (F) is inversely proportional to the square of the distance (r) between the centers of the two charges
- F = k * (q1 * q2) / r^2, where k is Coulomb's constant (approximately 8.99 x 10^9 N m^2 C^2)
- Force is attractive if charges are opposite in sign and repulsive if charges are the same sign

### Charge Conservation

- The total electric charge in a closed system remains constant over time
- Charge cannot be created or destroyed, only transferred from one object to another
- ΔQ = Q_final - Q_initial = 0, where ΔQ is the change in total charge
- Charge conservation is a fundamental principle in physics, applicable to all physical processes

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## Description

Understand Coulomb's Law, which describes the electrostatic force between two point charges, and learn how to calculate the force with the given formula.