# What Changes If i Place two magnets together?

1. May 10, 2013

### Sylvester1

What Changes If i Place two magnets together??

Hello everybody,

i wanted to ask what changes when i unite two magnets ??

except from the dimensions does magnetic moment, Br change?

2. May 10, 2013

### Simon Bridge

You mean when you sit a N-pole of one magnet on a S-pole of another?
You've just made a new magnet with poles farther apart haven't you?
You should be able to work out the consequences from you existing knowledge of how magnets work.

Similarly - what happens when you saw a magnet in half and separate the halves?

3. May 13, 2013

### Sylvester1

xmmm ok thanx!it is just that i read somewhere that magnetic moment goes to zero if i unite 2 magnets in their different poles and that confused me a bit!

4. May 13, 2013

### Simon Bridge

Magnetism is very complicated so it is common to get confused.
The moment between the poles gets very small as they approach each other - yes - and may go to zero if the model puts the pole "charge" on the surface of the physical magnets. However each magnet has another pole.

In a simple before and after picture using poles:
- before you had two separate short magnets each with two poles for a total of four;
- after you have one long magnet with two poles.