Rapport 7

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Florida Atlantic University *

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PHY2049L

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Physics

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Apr 3, 2024

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Experiment 7: Induced emf: magnet passes through a solenoid and Transformer Student name: Graham Herkenrath Pre-lab section: 1) Introduction: Explain the theory behind experiment 7.1 in a paragraph between 150 and 250 words. (2 Point) In this experiment we will be using a magnet to measure electromotive force or emf by passing the magnet through a solenoid. This works because magnetic flux changes throughout a coil as a magnet is passed through it which creates an electromotive force. We will be using Faraday’s law of induction: e= -N(delta(sigma)/delta(t)). In this equation e represents the induced electromotive force, N represents the number of turns of wire in the coil and the change in sigma divided by the change in time is the rate of change of the magnetic flux through each turn of the coil. When the magnetic flux is increasing it is called incoming flux and the incoming peak occurs when the electromotive force induced by the incoming flux versus time is displayed as a peak. When the magnetic flux decreases through each turn of the coil it is called outgoing flux and the outgoing peak occurs when the electromotive force induced by the outgoing flux versus time is displayed as a peak. 2) Hypothesis: In an If /Then statement, highlight the purpose of experiment 7.1. (0.5 points) If the incoming flux versus outgoing flux is a large difference than the area under incoming and outgoing peaks will be greater. 3) Introduction : In a paragraph between 75 and 100 words, explain the theory behind the experiment 7.2. (2 point) In this experiment we will be focusing on a transformer which is an electrical device that moves energy in two circuits using electromagnetic induction. Electromagnetic induction occurs when an electromotive force is produced across an electrical conductor in a charging magnetic field. In this experiment the transformer will serve as the electrical conductor. An important aspect of the transformer is the two coils which are electrically insulated from each other but are wound upon the same core. 4) Hypothesis: In an If /Then statement, highlight the purpose of experiment 7.2. (0.5 points) If the primary coil turns rapidly allowing power to transfer to the core and into the secondary coil then the induced electromotive force will be greater. Post-lab section: 5) Attach a picture of your signed data sheet for experiment 7.1 here. (1 point)

6) Attach the pictures of any table, chart, and plot here for experiment 7.1. (2 points)

7) In a paragraph between 100 and 150 words, explain in context of experiment 7.1: What did you Learn? What conclusion can you draw from the results of this lab assignment? (1 point) I learned that Lenz ’ s law impacts the direction in which the incoming and outgoing peaks go and also that the greater the current the greater the flux will be. I also learned that the configuration of the magnet and orientation of the north and south poles of the magnet impacts the turn of the coil. A conclusion I can draw from the results of this lab assignment is that the induced current in a resistor is affected by Lenz ’ s law to determine the orientation in terms of B to A or A to B. I also learned that Lenz ’ s law can be used effectively with magnets to determine flux and analyze peaks. 8) Attach your response to the questions in the lab manual here for experiment 7.1 . (1.7 points)

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9) Attach a picture of your signed data sheet for experiment 7.2 here. (1 point)

10) Attach the picture of any table, chart, and plot here for experiment 7.2. (4 points)

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11) In a paragraph between 100 and 150 words, explain in context of experiment 7.2: What did you Learn? What conclusion can you draw from the results of this lab assignment? (1 point)

I learned that certain interfaces and softwares can only support a certain amount of current supply or amps and that overwhelming these softwares can cause them to crash which is why its important to turn them off and on when moving wires. I also learned that a transformer cannot convert dc voltage because of how electromagnetic induction affects them. I learned that a turn ratio is found by dividing the secondary coils voltage with the primary coils voltage and that a step-down transformer has a greater Vp while a step-up is the opposite. A conclusion I can draw is that transformers are affected by both a primary and secondary coil which impact current and electromotive force as well as flux. 12) Upload pictures of your calculations for the following quantities of Experiment 7.2 Table 1 and Table 3 (1 point) :

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13) Attach a picture of your response to the questions in the lab manual here for Experiment 7.2 . (2.3 points)

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