1/23/2024 0 Comments Magnetic flux calculator coil![]() This rule is consistent with the field mapped for the long straight wire and is valid for any current segment. (b) Right hand rule 2 states that, if the right hand thumb points in the direction of the current, the fingers curl in the direction of the field. (a) Compasses placed near a long straight current-carrying wire indicate that field lines form circular loops centered on the wire. The right hand rule 2 (RHR-2) emerges from this exploration and is valid for any current segment- point the thumb in the direction of the current, and the fingers curl in the direction of the magnetic field loops created by it. The field around a long straight wire is found to be in circular loops. Hall probes can determine the magnitude of the field. As noted before, one way to explore the direction of a magnetic field is with compasses, as shown for a long straight current-carrying wire in Figure 1. Magnetic fields have both direction and magnitude. The magnetic field strength at the center of a circular loop is given by B0I2R(at center of loop), B 0 I 2 R (at center of loop), where R is the radius. ![]() Magnetic Field Created by a Long Straight Current-Carrying Wire: Right Hand Rule 2 How does the shape of wires carrying current affect the shape of the magnetic field created? We noted earlier that a current loop created a magnetic field similar to that of a bar magnet, but what about a straight wire or a toroid (doughnut)? How is the direction of a current-created field related to the direction of the current? Answers to these questions are explored in this section, together with a brief discussion of the law governing the fields created by currents. You might also be interested in the helical coil calculator. Indeed, when Oersted discovered in 1820 that a current in a wire affected a compass needle, he was not dealing with extremely large currents. How much current is needed to produce a significant magnetic field, perhaps as strong as the Earth’s field? Surveyors will tell you that overhead electric power lines create magnetic fields that interfere with their compass readings. Use the right hand rule 2 to determine the direction of current or the direction of magnetic field loops.Calculate current that produces a magnetic field.This paper develops expressions for the magnetic flux density produced by three rectangular loops of wire that lie in the same plane, i.e.,loops that are not co-axial. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License. square Helmholtz coil produces a greater volume of nearly uniform magnetic field than a circular Helmholtz coil of comparable dimensions 5. We recommend using aĪuthors: Paul Peter Urone, Roger Hinrichs Use the information below to generate a citation. Then you must include on every digital page view the following attribution: If you are redistributing all or part of this book in a digital format, Then you must include on every physical page the following attribution: If you are redistributing all or part of this book in a print format, Want to cite, share, or modify this book? This book uses the From the plot below, we can visualize the magnetic flux density. The model geometry for the Helmholtz coil tutorial. For this specific example, the coils are generated by 10 wire turns and a current of 0.25 mA passes through them. The current is a result of an emf induced by a changing magnetic field, whether or not there is a path for current to flow. To model the coils, we use the built-in 3D Magnetic Fields interface, which is available in the AC/DC Module. More basic than the current that flows is the emf that causes it. It is the change in magnetic field that creates the current. Closing and opening the switch induces the current. Interestingly, if the switch remains closed or open for any length of time, there is no current through the galvanometer. (You can also observe this in a physics lab.) Each time the switch is opened, the galvanometer detects a current in the opposite direction. It was found that each time the switch is closed, the galvanometer detects a current in one direction in the coil on the bottom. The galvanometer is used to detect any current induced in the coil on the bottom. When the switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom part of the ring. The apparatus used by Faraday to demonstrate that magnetic fields can create currents is illustrated in Figure 23.3. Describe methods to produce an electromotive force (emf) with a magnetic field or magnet and a loop of wire.Calculate the flux of a uniform magnetic field through a loop of arbitrary orientation.By the end of this section, you will be able to:
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