18_apply_mag - Lesson 18: Applying Concepts of Magnetic...

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Lesson 18: Applying Concepts of Magnetic Fields What we've been looking at lets us explain a lot of things, as well as come up with new ways of studying the world and building new devices. This lesson will look at some of the more advanced problems that can be solved by applying the concepts of magnetic fields, moving charges, and current carrying wires. Charges Trapped in Magnetic Fields If you've ever watched the Northern Lights (Aurora Borealis) then you've seen the effect of capturing a moving charged particle in a magnetic field. The Sun is constantly shooting off charged particles whenever a solar flare erupts on its surface. Some of these charged particles, moving at about 0.10c ( 10% the speed of light ) come flying right towards Earth. As they get near, they begin to interact with the magnetic field that surrounds the Earth, causing them to change their path. If the conditions are just right, some of these particles are funneled in at either the North or South poles and start to spiral in towards the ground. As the particles bump into air particles they can transfer energy that causes electrons to jump up energy levels. Since the electrons don't stay there long, they release energy as they fall back down, which we see as light. To see how this spiraling can happen, look at the following simplified diagram of an electron shot into a magnetic field. .. 1/21/2010 © studyphysics.ca Page 1 of 4 / Sections 12.2 & 12.3 X X X X X X X X X X X X X X X X B e - v (i) The electron is initially moving to the right as it approaches the magnetic field. B X X X X X X X X X X X X X X X X F (ii) Using the third hand rule, we can see that when the electron is traveling to the right it will experience a force pushing it down, so its path starts to curve down. e
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18_apply_mag - Lesson 18: Applying Concepts of Magnetic...

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