# Magnetism direction

1. Jul 21, 2017

### Cici2017

1. The problem statement, all variables and given/known data
A current carrying rod is held horizontally between the poles of a magnet by a magnetic force.
magnet-current (into the page) -magnet
determine which side is the north pole of the magnet?

2. Relevant equations

3. The attempt at a solution
If I use the right hand rule, then the magnetic field direction is clockwise around the current.
Is this right? What do I do next?

Thanks~

2. Jul 21, 2017

### Cici2017

This is the question:

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3. Jul 21, 2017

### Staff: Mentor

You don't want the magnetic field created by the current. You want the force on the current due to the magnetic field of the magnet.

4. Jul 21, 2017

### Staff: Mentor

5. Jul 21, 2017

### Cici2017

To determine the direction of the magnetic field, why do we use the Right hand rule instead of Fleming's left-hand rule? Thanks~

6. Jul 21, 2017

### TSny

There are various right-hand rules and left-hand rules that people have invented. Most recent textbooks that I have seen talk only about certain right-hand rules and don't mention any left-hand rules. But if you are familiar with Fleming's left-hand rule, then you can use it for this problem.

The right-hand rule to which @Doc Al refers is just as good and will yield the same result.

7. Jul 21, 2017

### Cici2017

Got it! Thank you so much~

8. Jul 21, 2017

### Cici2017

Hi, thank you! Can you please help me with this? It is a follow- up question of the previous one: