The right-hand rule
The magnitude of the force felt by a charge q moving with velocity v through a magnetic field B is:
As stated previously, the direction of the force is perpendicular to both v and B. One more thing must be said to define the direction. For example, if both v and B point in the plane of the screen, F could point either into or out of the screen to be perpendicular to both vectors. The flat right-hand rule is used to determine which of these two directions for F is the correct one.
To find the direction of
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