Magnetism; the path of electrons

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Electrons from an accelerator require a bending magnet to change their path by 90° to avoid barriers. The uniform magnetic field B in this magnet must meet the condition B >= sqrt(2*m*K/e²d²), where m is the mass of a proton, K is its kinetic energy, and d is the distance from the exit hole. The discussion highlights the fundamental principle that magnets can influence charged particles' trajectories. Understanding the relationship between magnetic fields and charged particle motion is crucial for solving this problem. The conversation emphasizes the need for a clear grasp of physics principles to approach such calculations effectively.
Stroobi
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The path of electrons emerging grom an accelerator must be bent by 90° by a 'bending magnet' so as not to strike a barrier in their path a distance d from their exit hole in the accelerator.
Show that the field B in de bending magnet, which we assume is uniform and can extend over an area d*d, must have magnitude B >= sq rt (2*m*K/e²d²), with m the mass of a proton and K is its kinetic energy.

How can I solve this porblem?
I really don't see it...
 
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