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When it comes to electric potential and electric force, Coulomb's constant is a key player. This constant, denoted by the letter "k," is a proportional factor in the electric force between two point charges. Its value is approximately \( 8.99 \times 10^9 \, \mathrm{Nm^2/C^2} \). This high value reflects the strength of the forces between charged particles.
Coulomb's constant is derived from Coulomb's Law, which quantifies the amount of force between two stationary, electrically charged particles. In the context of electric potential, it is used to calculate the potential energy per unit charge due to another charge.
Using \( k \) in the electric potential formula allows us to find out how much potential energy a test charge would have in the electric field created by another charge. This shows that even a small charge can have a significant potential due to the large multiplying factor of Coulomb's constant.

A point charge is a model of a charged object, used to simplify calculations in electromagnetism and electrostatics. It's an idealized model where the physical size of the charge is so small compared to the distances of interest, that it can be treated as a point.
Unlike distributed charges, which spread over a volume or surface, a point charge is considered to be concentrated at a single location. This makes calculations easier, as the electric field or potential can be calculated as if the entire charge is located at a single point.
In the problem above, the charges given, \(+3.40 \mu \mathrm{C}\) and \(-6.10 \mu \mathrm{C}\), are treated as point charges. This treatment simplifies finding the electric potential at the midpoint, as we only need to consider the straight-line distance between the charges and the point of interest.

The electric potential formula is essential when calculating the potential at a specific point from a point charge. It is given by \( V = \frac{k \cdot q}{r} \), where \( V \) is the electric potential, \( k \) is Coulomb's constant, \( q \) is the charge, and \( r \) is the distance from the charge to the point of interest.
Electric potential is a scalar quantity. This means it doesn't have direction, unlike electric fields, which are vector quantities. Therefore, the potentials from different charges can simply be added together to find the total potential at a point. This property makes potential calculations more straightforward.
In the exercise, we used this formula to determine the electric potential at the midpoint between the given charges. For each charge, we applied the formula separately and then summed the two results. By doing this, we found the net potential due to the effects of both point charges at the midpoint. Understanding how to use this formula is crucial for problems involving multiple charges and different configurations.