A majority of people are right handed, and therefore do almost about everything with their right hand. Here is yet another thing you can add onto the list of helpful things your handy dandy right hand does for you; figuring out the magnetic field based on the direction of current flow. These rules were discovered by a scientist called Oersted.
- Right-hand rule #1 for conventional current flow: Take the conductor with the thumb of the right hand pointing in the direction of conventional current flow. Your curved fingers show the direction of the magnetic field around the conductor. As you are aware, current flows from positive to negative.
2. Right-hand rule #2 for conventional current flow: Hold the coiled conductor with the right hand so that the curved fingers point in the positive current flow. The thumb points in the direction of the magnetic field within the coil. North end of the electromagnet produced by the coil is represented by outside the thumb. This predicts the relationship between the direction of conventional current flow and the magnetic field at the end of the electromagnet. You must also keep in mind that the thumb points to the North, and the fingers point to the direction of the current.
Here is also a link that you can watch a video on the right-hand rules to clarify any questions you have.
http://www.youtube.com/watch?v=qqkUeQ0nsF8&feature=related
-Peggy.
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