5 Steps to a 5: AP Physics 2: Algebra-Based 2021 by Christopher Bruhn

Author:Christopher Bruhn
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2021-11-15T00:00:00+00:00

The figure below shows how iron filings sprinkled onto a bar magnet gather on the magnetic field lines, making them visible.

The next diagram shows the magnetic vector field representation. Each individual arrow represents the magnetic field vector at that point. Longer arrows mean a larger field strength.

The space around a magnet contains a magnetic field. All magnetic fields are created by moving charges. In a permanent magnet, like the ones you stick on your refrigerator, the moving charges are the electrons spinning around the nucleus of the atoms. Remember that currents are moving charges in a wire, so they also create magnetic fields. We will talk about that in a minute.

Remember that I said we would be dealing with three dimensions? A piece of paper is two-dimensional, so physicists came up with some nice ways to draw magnetic fields that are going in or out of the page. For a magnetic field going into the page, a bunch of X’s will be drawn. For a magnetic field coming out of the page, a bunch of dots will be drawn. In the next figure you will see two different variations of how each of these is drawn.

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