# What gives rise to a magnetic moment in a proton/neutron?

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1. Mar 30, 2016

### pbutter

1. The problem statement, all variables and given/known data
Describe, with examples, what is meant by magnetic moment. What gives rise to a magnetic moment in a proton/neutron?

2. Relevant equations

3. The attempt at a solution
I know what a magnetic moment is, just struggling with the other parts of the question.
So what I'm thinking is that an electron orbiting generates a magnetic moment since it is a charged particle moving in a circle. In the same way the spin of a nucleus generates a magnetic moment since the nucleus is comprised of charged quarks which are spinning when the proton/neutron is spinning. Is this correct?

2. Mar 30, 2016

### Orodruin

Staff Emeritus
No, it is not correct. Your view of how things work is way too classical. Why do you think an electron has a magnetic moment? (It is a point particle.)

3. Mar 30, 2016

### pbutter

Electron generates a magnetic field when it travels in a circle (I x A)

4. Mar 30, 2016

### pbutter

Also how would a magnetic moment be generated in a neutron/proton, is it just be because of the spin that it has or is it just some inherent property that we have learnt to accept but no answer

5. Mar 30, 2016

### Orodruin

Staff Emeritus
No, even a stationary electron has a magnetic moment.

6. Mar 30, 2016

### pbutter

I think I'm sort of getting it spin is just something that elementary particles have. It is intrinsic to them and anything charged with a spin/angular momentum will have a magnetic moment.

7. Mar 30, 2016

### Orodruin

Staff Emeritus
Even uncharged particles can have an intrinsic magnetic moment, but yes, it is a property of the elementary particle. Just as elementary particles have mass or charge, they in general have an intrinsic angular momentum and magnetic moment.

8. Mar 30, 2016

### epenguin

The question was about a proton or neutron, not electron.