Force on an Electric Charge Moving in a Magnetic Field

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Presentation transcript:

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. 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?

Magnetic Field Due to a Straight Wire

Force between Two Parallel Wires

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.