Phy Lab 14.docx - Magnetic Field Mapping and Electromagnetic Induction Phy 216-06 Group 1 Destiny Ball Ajahni Franklin Amanda Harvey Andre Roots Dylan

# Phy Lab 14.docx - Magnetic Field Mapping and...

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Magnetic Field Mapping and Electromagnetic Induction Phy 216-06 Group 1 Destiny Ball, Ajahni Franklin, Amanda Harvey, Andre Roots, Dylan Scott, 02/12/19 Title Page & Format _____(10 pt max) Purpose & Introduction _____(10 pt max Experimental Details _____(10 pt max) Results and Discussion _____(50 pt max) Conclusion _____(15 pt max) References _____(5 pt max) Total Grade ________
Section 1: Purpose and Introduction The purpose of the experiment was to use the relationship between changing magnetic field and current to map a magnetic field between two magnetics and analyze electromagnetic induction. The main physics concepts in this experiment were the properties of magnets, with south and north poles, and current produced by the changing magnetic fields. In this experiment two magnets and a compass were used to construct the mapping of the magnetic field. The compass was used to help plot the magnetic field lines because the needle in a compass should point in the direction of a magnetic north pole or along the north pole field lines. A magnetic field is the area around any magnet that exerts a force on any object inside the field. Each magnetic field has field lines that leave from the north pole and enter the south pole. A magnet can be defined as an object that is composed of metals that show attractive and repulsive forces to other metals of the same kind. The field lines were constructed on a piece of paper knowing the fact that similar charges/poles repel and unlike charges/poles attack were constructed on a piece of paper. Changing magnetic fields produce changing electric fields which in turn may create a induced current [1]. This occurrence is shown in the experiment and used as one of the fundamental parts of the process. The phenomenon can be explained by Faraday’s Law for a changing magnetic flux [1]: ε =− N ∆Φ ∆t =− N ( Φ Φ t t ) =− N ( BAcosθ B Acosθ t t ¿ (1) Where ε is the electromotive force from a changing electric field (emf) in volts, B is the magnetic field strength in Teslas, A is the area of the coil in meters squared, θ is the angle between the surface normal of the coil and the magnetic field, t is the change in time, N is the number of loops (windings) of the coil of wire. Section 2: Experimental Details In this experiment a compass was used to map a magnetic field. Two coils were used in tandem with a power supply and a bar magnet to determine the effects of a change in the magnetic field inside of the coils that induced current that was measured by a galvanometer. To complete the mapping of the magnetic fields first the horseshoe magnetic and bar magnet were placed on different sides of the paper diagonally from each other. The presence of a magnet produces a magnetic field so the field was mapped when combining the two magnets by use of a compass to draw directional lines at all key spots that were located: between the horseshoe magnet on the sides of the bar magnet, in the middle of the bar and horseshoe magnet and at the point where the north pole field lines meet and repel each other. The second part of this experiment was analyzing an induced current from a changing magnetic field. The large coil was