# Homework Help: Equatorial velocity

1. Jan 3, 2006

### asdf1

for the following problem:
find the equatorial velocity v of an electron under the assumption that it is a uniform sphere of radius r=5*10^(-17) m that is rotating about an axis through its center.

how do you start thinking for that one?

2. Jan 3, 2006

### Galileo

Do you assume it is spinning such that it has a magnetic moment of $\hbar/2$ ?

3. Jan 4, 2006

### asdf1

what do you mean? @@

4. Jan 4, 2006

### Galileo

You assume the electron is a uniformly charged sphere with charge -e. Then finding the equatorial velocity means finding how fast the electron would be spinning right? I assume you have to link the magnetic moment of the spinning sphere to that of the electron (i.e. its spin).

Why don't you post the whole question along with the context in which we should consider it. And also what you have done so far.

5. Jan 5, 2006

### asdf1

:P
that is the whole question...
how'd you think of linking the magnetic moment of the spinning sphere to that of the electron ?

6. Jan 6, 2006

### Galileo

Well, what other physical property would you link it to? An electron has charge and spin.

7. Jan 6, 2006

### asdf1

haha... you're right~ thank you very much!!!

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