21. The right hand rule relates this direction to the clockwise or counter-clockwise rotation in the plane of the drawing. 22. Magnetic current ( flowing magnetic monopoles ), M, creates an electric field, E, in accordance with the left-hand rule . 23. Positive traversal of " ? is then counterclockwise ( right-hand rule with thumb along " z "-axis ). 24. This is the right-hand rule . 25. Note that for circular polarization, optical researchers use the opposite right hand rule from the one used by radio engineers. 26. Still using the left-hand rule the painter now searches for a simple passage ( made by two boundary pixels ). 27. If both are empty, then the current pixel can be painted and the painter can move following the right-hand rule . 28. The IAU also uses the right-hand rule to define a " positive pole " for the purpose of determining orientation. 29. For example, one method would be to compare it to an electromagnet, whose poles can be identified by the right-hand rule . 30. The helix in the antenna can twist in two possible directions : right-handed or left-handed, as defined by the right-hand rule .
