Task: Text Categorization
Input (English): In 1878 Henry Rowland showed that this could be produced by spinning a vulcanite plate sandwiched between two glass plates. Zeeman showed that it could split spectral lines, useful in electron paramagnetic resonance spectroscopy, and a voltage difference is created by it applied perpendicularly to an electron flow in a conductor in what as known as the Hall effect. Purcell pedagogically described it as the relativistic side effect of electrons moving near one another, and the force on a moving charged particle is calculated by taking the cross product of the velocity and it. For 10 points, identify this field produced by a moving charge or a changing electric field measured in Tesla.
Output (English): Science