## Questions and Answers

What is the formula to calculate the magnitude of the force between two electric charges?

F = k * (q1 * q2) / r^2

What does the constant 'k' in the formula represent?

Constant of proportionality depending on units and medium

How is the direction of the force between two charges represented?

Using a unit vector along the line joining the charges

What is the vector form of the force exerted by charge q₁ on q₂?

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How is the force exerted by charge q₁ on q₂ related to the force exerted by q₂ on q₁?

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How is the force exerted by a charge q₁ on q₂ conventionally denoted?

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## Study Notes

### Electric Force Between Two Charges

- The magnitude of the force (F) between two electric charges (q₁ and q₂) separated by a distance (r) is given by: F = k * q₁q₂ / r², where k is a constant of proportionality.
- The value of k depends on the system of units used and the medium between the charges.
- The electric charges are assumed to be point or localized charges, provided the size of the bodies carrying the charges is very small compared to the distance between them.

### Direction of the Force

- To show the direction of the force, a unit vector (î) is used, pointing from the charge q₁ towards the charge q₂.
- The force exerted by charge q₁ on charge q₂ in vector form is: F₁₂ = k * q₁q₂ / r² â.
- The force exerted by charge q₂ on charge q₁ in vector form is: F₂₁ = k * q₁q₂ / r² â.

### Force Exerted Between Charges

- The force exerted by charge q₁ on q₂ is conventionally denoted by F₁₂.
- The force exerted by charge q₂ on q₁ is conventionally denoted by F₂₁.
- F₁₂ = -F₂₁, implying that the force exerted by one charge on the other is equal in magnitude but opposite in direction.

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## Description

Learn about the magnitude of the force between two electric charges separated by a distance using the constant of proportionality. Understand the concept of point charges and their interaction based on the distance between them.