You should be able to use magnetic field lines to sketch a representation of a bar magnet's magnetic field by now. You also should be able to use the right hand rule for currents to sketch the magnetic fields produced around electric currents. Today we dealt with forces that magnetic fields exert on moving electric charge. It's a weird force, one that we wouldn't have predicted, and it is described by a mathematical tool, the cross product: Here's our assignment for Friday. Just work on the first two items unless you want the challenge of finishing it on your own. The information is in Sections 3 and 4 of Chapter 20.
Can you figure out which of the particles that trace out the paths shown below are positively charged? The magnetic field that made the charged particles curve as they traveled along is directed into the picture. The initial particle that caused all the havoc you see entered the picture traveling from bottom to top, and that's the general flow of things here (as a result of momentum conservation).
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Physics IIMr. Swackhamer Archives
May 2019
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