An electron moving along the +x axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component along the -z-axis.
- Fleming's left-hand rule tells us that a positive charge experiences a magnetic force perpendicular to the plane in which the velocity vector and the magnetic field vector are located when it moves at a velocity v that is perpendicular to the direction of the magnetic field.
- In this instance, all three vectors are mutually perpendicular.
- Here, under the circumstances, a negative charge is traveling down the x-axis and is deflected in the -y direction, causing the magnetic field to be along the negative z-axis, or into the screen.
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