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Unformatted text preview: PHYSICS 127 EXPERIMENT NO. 5 MAGNETIC FORCE I In this experiment we will determine the vertical component of the earth's magnetic field by measuring the deflection of a current-carrying wire stretched between two supports. A. Equipment 1 Power Supply, 1 Pulley and Table Clamp, 1 Microscope with Calibrated Reticule, 1 Viewing Lamp, 1 50A Current Shunt, 1 Digital Voltmeter, 1 DPDT Switch. B. Method A thin, flexible copper wire (#31 gauge) is fixed at one end and passed over a pulley at the other. Mechanical tension is maintained by a 20 gram mass, as shown in Figure 1. I wire Mass 20 grams Shunt Power Supply I I Digital Voltmeter pulley Fixed Support Figure 1: Experimental Setup. The power supply enables us to pass an adjustable current I through the wire. A wire segment of length l carrying a current I in the presence of a uniform magnetic field B experiences a force given by F = I l B (1) l is a vector whose magnitude is the length of the wire segment and whose direction is parallel to the direction of (conventional) current flow. See pp....
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