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Force on an Electric Charge Moving in a Magnetic Field. F=qvB sin q. Right-Hand Rule Again. Important: right-hand rule defines direction of a force acting on a positive charge. For negatively charged particles the force is in exactly the opposite direction.
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Important: right-hand rule defines direction of a force acting on a positive charge. For negatively charged particles the force is in exactly the opposite direction. Don’t forget this when you are solving problems about electrons!!!
Electron’s Path in a Uniform Magnetic Field An electron travels at velocity v in a plane perpendicular to a magnetic field. Describe its path.
Conceptual Example: A Spiral Path What is the path of a charged particle if its velocity is not perpendicular to the magnetic field?
Each current produces magnetic field that is “felt” by the other wire so that each must exert a force on the other.
Parallel current in the same directions attract each other, antiparallel currents repel.