# Fleming left hand rule or right hand grip rule?

1. Oct 12, 2015

### Help help

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

2. Relevant equations

3. The attempt at a solution

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2. Oct 13, 2015

### PWiz

For current carrying wires, always use the right hand grip rule to determine the direction of the magnetic field lines.

3. Oct 13, 2015

### Help help

Thanks.

I don't get why the answer is C. :(

4. Oct 13, 2015

### PWiz

If you grip the wire with your right hand with your thumb pointing in the current's direction, your fingers will curl from P to Q. (Imagine a coil around the wire with the arrows pointing in the same direction as your fingers)
M is right below the wire. The direction of your fingers right below you thumb will then point toward P. You can imagine your right hand moving vertically downwards in the grip position until your fingers touch the cardboard (like bringing a fist down on the cardboard, only with your thumb pointing out). At the point of contact of your fingers with the cardboard, your fingers will point towards P.

5. Apr 9, 2016

Thanks. ;)

6. Apr 9, 2016

### Help help

Thanks for ur great help! ;)