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# Lab_8 - Lab 8 Magnetic Dipoles OBJECTIVES In this lab you...

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Lab 8: Magnetic Dipoles OBJECTIVES In this lab you will Measure the magnetic field of a circular loop of wire and a bar magnet Map the magnetic field vectors in the space surrounding the loop and magnet Calculate the distance dependence of both the loop and the bar magnet Calculate the dipole moment in both the loop and the bar magnet In lecture you’ve learned about the magnetic field created by a current loop and about the magnetic field created by a bar magnet. They may seem to be different phenomena, however, after comparing their magnetic field patterns, and distance dependences, you will see that they are in fact very similar. You will then compare these two objects by calculating their dipole moments. 1) Warm-Up Problem: Problem (1) A thin circular coil of wire of radius 5 cm consists of 100 turns of wire, as shown. If the conventional current in the wire is 4 amperes, and runs in the counter clockwise direction, what are the magnitude and direction of the magnetic field at the center of the coil? CHECKPOINT 1: Ask an instructor to check your work for credit. You may proceed while you wait to be checked off 2) The Patterns of Magnetic Field and Measurements a) Get out the following items for this lab: 1 battery with holder 2 alligator clips 1 long wire 1 bar magnet 1 ruler or meter stick 1 compass

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b) Put away everything else (except your lab manual), so your table is neat and clear.
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Lab_8 - Lab 8 Magnetic Dipoles OBJECTIVES In this lab you...

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