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Experiment 4 - Magnetic Fields

# Experiment 4 - Magnetic Fields - Magnetic Fields...

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Magnetic Fields Experiment #4 Jae Chung 10/22/2007

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Introduction: In this lab, we measured the magnetic field produced by an electromagnet in two different ways: one way by using a current balance and the other way is using a search coil. With the current balance, we had a magnetic field of 0.194164 ± 0.002736 for 5A, 0.167893 ± 0.003977 for 4A, 0.123968 ± 0.004389 for 3A, and 0.085032 ± 0.004506 for 2A. With the electromagnet we got a magnetic field of 0.182709 ± 0.010123 for 5A, 0.141599 ± 0.009479 for 4A, 0.105058 ± 0.007889 for 3A, and 0.073084 ± 0.007021 for 2A. The results meet our general expectation that the magnetic field would increase linearly as current increased. However, the discrepancy between the magnetic field values from both parts of the experiment suggests that there are sources of error affecting the results. Procedure: For the first part of the experiment, we measured the length of the conducting rod with a caliper and obtained 5 sequentially increasing weight setups. Next, we connected the current balance to the power supply with wires, and then we turned the current dial down to zero and the volt dial clockwise to its maximum. After this, we set the range to 3A and connected the electromagnet to another power supply with an ammeter. We calibrated the current balance by adjusting the screw on the balance so that it was level with no weights on it. Finally, we set the current to run with 5A through the electromagnet and put a washer on the balance.

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With the current dial, we manipulated i and recorded the values which balanced the setup. This process was repeated 4 more times—each time using the next weight and continuously recording the values of i. Then we repeated this entire process with I = 4A, 3A, and 2A respectively. For the second portion of this lab, we first set up the apparatus by connecting the
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Experiment 4 - Magnetic Fields - Magnetic Fields...

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