B-Field of an Infinite Sheet of current

In this video, we find the magnetic field for an infinite sheet of current with linear current density K. We make a symmetry argument to figure out what the magnetic field looks like above and below the magnetic sheet of current, and then apply Ampere's Law to find out the magnetic field.

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This is part of my series on introductory electromagnetism, where we explore one of the fundamental forces of nature - how your phone charges and communicates with the rest of the world, why you should be afraid of the sun, and the fundamentals of electric and magnetic forces and fields, voltages,