Hall, the positive sign indicating that the electromotive force is in the same direction as the mechanical force acting upon the conductor.
The value of l may be easily shown to be (r i -Er 2)1r/2 (r i t r 2)a-+-c cos a, where the positive sign is to be taken for a crossed belt and the negative sign for an open belt.
For example, while some people make the claim that indirect eye contact is a positive sign that a person is lying, a lot depends on the person's usual behavior.
To add to the positive sign that her fans still support her despite her personal troubles, "Gimme More" made its first appearance on the Hot 100 at the much coveted number one spot.
It is a positive sign of developing intelligence and of an active and healthy imagination.
