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Unformatted text preview: Saad Ghazipura Physics 134 Lab Partner Chaomin Tang Date of lab:3/26/08 Magnetic Forces - 1 Purpose The purpose of this lab was to determine the vertical component of Earth’s Magnetic Field through measurement of a current-carrying wire that is stretched between two supports. The formula for magnetic force is F= l IxB. A 20 g mass was attached to the end of the wire, thus resulting in mechanical tension equivalent to T(x)=cosθ=T . The maximum deflection is calculated using the equation y max =(IB vert / T )/.5L 2 . The current will be measured to find y max to determine B vert . Introduction Earth’s magnetic field is caused by the dynamo theory in which the motion of a conductive body in the presence of a magnetic field regenerates the magnetic field. The liquid iron in Earth’s outer core is what drives the dynamo action. The convection of molten iron along with the Coriolis Effect- the overall rotation of the planet that organizes current along the north-south polar axis causes the magnetic field. rotation of the planet that organizes current along the north-south polar axis causes the magnetic field....
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