A. Manalaysay – PHY2054, Fall 2004 CHAPTER 19 This chapter’s an introduction to magnetic fields. Magnetic fields are similar (but a little more complicated) than electric fields. You’re familiar with a bar magnet probably; magnetic field lines point out of a north pole and into a south pole. The Earth’s magnetic field at the surface points north, geographically (i.e. away from Antarctica). But this means the field lines point out of Antarctica, which means that is where the magnetic north pole is. If this is confusing, look at page 589 of your book for a diagram. Magnetic fields can produce a force on a charged particle:---Magnetic force on a charged particle (magnitude only) “q” is the charge, “v” is the velocity, “B” is the magnetic field, and “ ” is the angle between the magnetic field and the velocity . To find the direction of the magnetic force, use the Right-Hand-Rule: with your right hand, hold your fingers straight and in the direction of the B-field, your thumb in the
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