PHY122 lab 9 magnetic field

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School

Stony Brook University *

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Course

122

Subject

Physics

Date

Apr 3, 2024

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docx

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Uploaded by EarlMantisMaster964

Introduction:

In this lab I will be measuring the magnetic field that is created by a current flowing through a long straight wire. Using the lab devices magnetometer with the wheel to measure the magnetic field as a function of position near to a wire carrying a large current. The analysis of the data will confirm the result from Ampere’s Law and also the shape of the magnetic field as being composed of concentric circles surrounding the wire. Objectives: ● Measuring magnetic field strength and direction ● Understand how to derive the field of a wire using Ampere's law ● Verify the shape of the magnetic field around a wire (circles) ● Verify that the magnitude of the field dallas off as 1/r Materials needed: ● 3 or 4 D batteries with appropriate battery cage ● Breadboard ● Two 0.5 resistors ● 12 ft spool of wire ● Wire leads We will be measuring the magnetic field due to a large amount of current flowing through a wire. The magnetic fields will be rather small . When it comes to Ampere’s law, a collection of currents that exhibits sufficient symmetry, provides the simplest means by which to calculate the magnetic field. This law states that: Simple solutions are available when the magnetic field is uniform along some closed path. The screenshot below contains a diagram which was shown in the lab.

The field lines make circles which are centered on the wire and define that we should walk a circular amperes path. On this path, B is both constant and also parallel to dL.. Meaning:

In this experiment, I was able to show how this formula is correct. The measurement: The lab device has a magnetometer in its upper left corner. We will be using the same setup as we did in the last lab, using three “ D cells” and two high power 0.5 ohm resistors to make a large enough current in order to sense the magnetic field. Then we will roll the lab device magnetometer through the field.

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