Potential between two particles

• Cosmossos
In summary, when two particles with opposite charges are placed close together, they will attract each other due to the potential between them. However, as the distance between them decreases, the force of attraction will become stronger. The distance can never be zero because particles have a size and the distance is measured from their center to center. Additionally, even if the particles did not have a size, the potential cannot reach infinity because the force of attraction would cause them to get closer until they touch. This is not physically possible as particles cannot have zero separation.
Cosmossos
Hello
If we have two particles +q and -q. then the potential between them is <0 and therefore they will attract to each other. but what will happen when r is almost 0 (since we have r in the denominator)?

The force of attraction gets larger as the distance diminishes.
The distance can never be zero because charges have size and the distance is measured from center to center. When the charges touch, some or all will cancel.

We cannot make the separation 0 between the two charges, however if you place a third particle very far away the force on the test particle from the difference in the charges will approximately cancel out.

I understand that, but let's say that the particles don't have "size", then in r=0 the potential will be infinity. the force of the attraction will cause them to get closer until r=0 , so how the potential can grow to infinty?

It can't because the particles do have size! You can't say "let's ignore physics" and then ask what physics says!

What is the potential between two particles?

The potential between two particles is a measure of the amount of energy that is required to move the particles from their current positions to an infinite distance away from each other. It is a scalar quantity and is usually denoted by the symbol V.

How is the potential between two particles calculated?

The potential between two particles is calculated using the equation V = kq1q2/r, where k is the Coulomb's constant, q1 and q2 are the charges of the particles, and r is the distance between them. This equation is known as Coulomb's law.

What factors affect the potential between two particles?

The potential between two particles is affected by the charges of the particles, the distance between them, and the medium in which they are located. An increase in either the charges or the distance will result in an increase in potential, while a change in the medium may alter the value of the Coulomb's constant.

What are the units of potential between two particles?

The SI unit of potential is joules per coulomb (J/C), which is equivalent to volts (V). However, it is also common to use the unit electron volts (eV) in particle physics, where 1 eV = 1.602 x 10^-19 J.

What is the difference between potential and potential energy?

Potential is a measure of the amount of energy per unit charge, while potential energy is the energy associated with the position or configuration of a system. The potential between two particles is the potential energy per unit charge for those two particles at a specific distance apart.

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