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Electrostatic force is a fundamental concept in physics, especially important in understanding how charged particles interact. It is the force that acts between charged objects. When charges are stationary, the force governing their interactions is known as electrostatic force. Coulomb's Law is used to calculate the magnitude of this force. It states that the force between two point charges is directly proportional to the product of the absolute values of the charges and inversely proportional to the square of the distance between them.

In formula terms, Coulomb's Law is expressed as:

• \( F = k * \frac{{|q_1 * q_2|}}{{r^2}} \)

where:

• \( F \) is the electrostatic force.
• \( k \) is Coulomb's constant, approximately \(8.99 \times 10^9 \text{Nm}^2/ ext{C}^2\).
• \( q_1 \) and \( q_2 \) are the point charges.
• \( r \) is the distance between the charges.

Understanding this principle helps explain a wide range of phenomena, from the behavior of atoms and molecules to the functioning of larger systems like capacitors in electronic circuits.

The way charges interact is foundational to many branches of physics and everyday phenomena. Charges come in two types: positive and negative. The interactions between charges are determined by their signs:

• Like charges (both positive or both negative) repel each other. The force pushes the charges apart.
• Opposite charges (one positive, one negative) attract each other. Here, the force pulls the charges together.

In our exercise, the force is repulsive because both given charges are positive. This means that each charge experiences a force pushing it away from the other. This interaction helps us understand why like charges don't accumulate easily in one place and how they seek to minimize energy states by distancing themselves.

The International System of Units (SI Units) is crucial for consistent scientific communication. In the context of electrostatics, the charge is measured in Coulombs, which is the standard SI unit for electric charge. However, in many practical contexts, charges are often given in smaller units such as nanocoulombs (nC) because typical everyday charges are much smaller than one Coulomb.

• 1 Coulomb (C) is equivalent to \(10^9\) nanocoulombs (nC).

In the original exercise, charges were provided in nanocoulombs. Converting them to Coulombs is essential when performing calculations to ensure accuracy and standardization. A uniform unit system, like the SI system, allows scientists to ensure measurements and calculations are interpretable and comparable across different studies and fields.