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<p>for radial deflection:1. B fields always a force perpendicular to the direction of motion and therefore it is much easier to build a setup for circular motion using this type of field2. In relativistic energies the Energy required to create this motion is so large, that when an E field is used, it causes vacuum-electrical breakdown of the materials used in the system. This doesn't happen with a B field precisely because the <a href="page.php?w=Lorentz_force">Lorentz force</a> induced by it is proportional to the velocity - if a particle doesn't</p><p>
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