In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Let me give you an example: In one work this author details the life of a tomb-maker who makes extra money by playing the organ at an insane asylum, while another of his novels sees Swartz give a refugee proper documentation only after he tells him his life story in the title Portuguese city. In addition to The Black Obelisk and The Night in Lisbon, he also wrote about Robert and Otto selling their auto workshop and visiting Patrice in a Swiss tuberculosis sanatorium in his novel The Three Comrades, while the turbulent life of the German surgeon Ravic is told in The Arch of Triumph. Another of his novels, The Road Back, is thought to be a sequel to his most famous book, in which the patriotic teacher Kantorek convinces Paul Bumer and his friends to join the Germany Army during World War I. For 10 points, name this German author who wrote All Quiet on the Western Front.
The answer to this example can be: Literature
Here is why: The text is talking about an author and their works, so it belongs to theliterature category.

OK. solve this:
Particles of dielectric materials may be separated in a fractionation method that uses a nonuniform one of these. Band-bending occurs because it varies linearly in a depletion layer. Symmetric top molecules undergo line-splitting in their microwave spectrum due to the application of one of these. Modulators for active Q-switching lasers rely on an effect in which crystals lacking inversion symmetry become birefringent in linear proportion to the magnitude of one of these. Its flux through a surface is proportional to enclosed charge, and its curl is equal to the negative time partial of the magnetic field. Its magnitude is proportional to one-over-r for a line charge, and it is proportional to one over r squared for a point charge. For 10 points, name this vector field given in units of volts per meter.
Answer:
Science