# How to find electromagnetic force between nucleus and electron?

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Hello, I'm new here and honestly I'm not a physics student. I'm studying engineering and so, understand little of physics. I am trying to find the bond force of graphene's free electron. That means, the electromagnetic force by which the electron is bound to the nucleus. I can only calculate it using Coulomb's law but I suppose that wouldn't be correct in this case. So, any help is appreciated.

PS: Another way of simplifying it would be, "How much static electric field is required to detach the electron?"

## Answers and Replies

DrClaude
Mentor
That's not something you can calculate simply.

You can try to google "graphene ionization energy" or "graphene work function" to find how much energy is needed to remove an electron from graphene (it turns ou to be around 4.5 eV).

That's not something you can calculate simply.

You can try to google "graphene ionization energy" or "graphene work function" to find how much energy is needed to remove an electron from graphene (it turns ou to be around 4.5 eV).
Thanks, for the reply. But that is not what I'm trying to find. I'm trying to find the necessary electric field (or potential) to ionize the electron.

davenn
Science Advisor
Gold Member
Vanadium 50
Staff Emeritus
Science Advisor
Education Advisor
eV is a unit of energy, not voltage. Or field.

An order of magnitude estimate is the electron charge divided by the Bohr radius. In real life, an answer is not simple:
1. This requires a quantum mechanical description of the atom
2. This requires a quantum mechanical description of the electric field
3. The other electrons in the atom move in response to the applied field, changing the overall electric field