The two right hand rules were featured today as we tried our best to get a grip on what nature is like. The first right hand rule we encountered was the right hand rule for magnetic fields created by electric currents. As an exercise, you should be able to figure out the direction of the magnetic field created by the current inside the loop shown below. Can you? Can you figure out the direction of the magnetic force on the particle at the moment that it enters the magnetic field in the diagram below? 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: 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 II
Mr. Swackhamer Scottsdale Preparatory Academy Archives
March 2020
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