PHY134_MagneticForce1 - Experiment 5 PHY134 Classical...

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Experiment 5 PHY134 - Classical Physics II Laboratory Magnetic Forces - 1 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. Equipment Power supply Pulley and table clamp Microscope with calibrated reticule Viewing lamp 50A Current shunt Digital voltmeter DPDT switch 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. 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) where l is a vector whose magnitude is the length of the wire segment and whose direction is in the direction of the (conventional) current flow. Q1. Draw a clear, well-labeled diagram showing current flow in the wire, the vector B having the approximate direction of the Earth's field in the laboratory, and the resulting force vector F on the wire
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