Given the task definition and input, reply with output. 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.

The diffusion coefficient in Bohm diffusion is equal to Boltzmann's constant times temperature over 16 times charge times this. The Verdet constant relates this and the angle of rotation due to the Faraday effect. When a charged particle moves through one of these, the force can be given by the charge times the velocity crossed with this. In a solenoid, it is equal to current times turn density times the permeability constant. When using the right-hand-rule for a moving charge, the direction of this is represented by the middle finger, and inductors store their energy in these. Name this type of field measured in tesla, the lines of which one can see when spreading iron filings around a bar magnet.
Science