PHYS 255b-004 PreLab - Magnetic Field Around a Wire

# PHYS 255b-004 PreLab - Magnetic Field Around a Wire - 4 Set...

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Magnetic Field Around a Wire Shannon Berg October 21, 2010 Physics 255b Section 4 Object The purpose of this experiment is to understand how magnetic field strength relates to current, how magnetic fields are situated around a current-carrying wire, and also to be able to find the permeability of free space and compare it to the accepted value. Apparatus 1) PASPORT Voltage-Current Sensor 2) PASPORT Magnetic Field Sensor 3) 2 USB Links 4) Clamp, Buret 5) ~1 inch of tape 6) Power supply, 18 V DC, 5 A 7) Large Rod Base 8) Patch Cords, 4 mm, Red (5) 9) Wire 10) Support Rod, 45 cm Procedure 1) Wrap wire around an object of reasonable diameter, count the number of wraps, and measure the coil's diameter. 2) Tape the coil and sand the wire ends to create better contact. 3) Attach utility clamp to stand and open the clamp so the Magnetic Field Sensor can fit inside, then attach the sensor with probe pointing down and place the coil under the sensor.

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Unformatted text preview: 4) Set up the circuit to be able to measure current through the coil (p. 141). 5) Current should be set to zero, then click start and slowly increase the current to 1 A and then click stop. 6) Click scale to fit, highlight the flat-middle part of graph, click fit, select linear fit, and record the slope from the legend box. Theory Statement With the slope from the graph which is given in gauss units, we can convert it to tesla units by ( =- 1 gauss 10 4 tesla ). Then we can rearrange the equation = B Nμ0I2R to solve for the permeability of free space (µ ), where B is the magnetic field, or slope in tesla units, N is the number of wraps, I is the current in Amperes, and R is resistance in Ohms. Then we can compute the percent difference in our measure permeability of free space and the theoretical permeability of free space which is 1.26 x 10-6 T·m/A. 1 2...
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PHYS 255b-004 PreLab - Magnetic Field Around a Wire - 4 Set...

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