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Magnetism Investigation PURPOSE To measure the magnetic force between two current-carrying conductors, and calculate the magnetic permability of free space. WHAT'S THE POINT? To see magnetic fields producing a force on a conductor which carries a current. BACKGROUND READING: Cutnell and Johnson, Chapter 21, Sections 5 and 10. INTRODUCTION AND THEORY: When a current I passes through a long, straight conductor, a magnetic field B is created. According to Ampere's law, the magnitude of the field at a perpendicular distance d from the conductor is given by the relation. mu * I B = -------------- 2 * pi * d In SI units the magnetic field is measured in tesla when I is in amperes and d is in meters. The quantity mu is a constant known as the permeability of free space and has the assigned value of -7 tesla * meter mu = 4 * pi...

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