# Two parallel currents

1. Mar 5, 2014

### ivanwho49

1. The problem statement, all variables and given/known data

Two current carrying wires run parallel. The bottom wire creates a magnetic field at a point on the top wire. What direction is the force on the left wire?

--------->------
--------->------

2. Relevant equations

I'm assuming there's no equation, just the right hand rule..?

3. The attempt at a solution

I think this problem asks for the right hand rule, but I'm not sure. I don't have a very good grasp of the right hand rule... I'm assuming it is dependent on the direction of the magnetic field and something else.

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Mar 5, 2014

### Staff: Mentor

Hi ivanwho49. I see a top wire and a bottom wire...but where's the left wire?

The right-hand rule sounds good!

3. Mar 5, 2014

### ivanwho49

Sorry, I meant top. Top = left. What two things do I use the right hand rule with though?

4. Mar 5, 2014

5. Mar 5, 2014

### Staff: Mentor

There are two different "right-hand rules". Use the right one first, it needs only one "thing", viz., direction of current.