Electromagnetic Induction: Magnetic Fields and Electric Currents, Lab Reports of Physics

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Taylor Williams

Electromagnetic Induction

July 5, 2022

Week 5

Objectives Explore how a changing magnetic field can induce an electric current. A magnet can be moved up or down at a constant velocity below a loop of wire, or the loop of wire may be dragged in any direction or rotated. The magnetic and electric fields can be displayed, as well as the magnetic flux and the current in the wire. My hypothesis is that the closer the lightbulb is to the magnetic the stronger the flux. Data Q1: Suppose you were asked to demonstrate electromagnetic induction. Which of the following situations will result in an electric current? A1: All of the above Q2: Which image represents the force on a positively charged particle caused by an approaching magnet? A2: Image D Q3: In the image below, which wire loop is experiencing the greatest magnetic flux? A3: Loop D

Figure 2 magnetic flux Question 4: If both the magnet and the wire loop are stationary, there will be no current in the wire, so C is incorrect. The current in the loop will increase if the change in magnetic flux per unit time increases. Speeding up the magnet will increase the rate at which the magnetic field changes, and therefore will increase the rate at which the magnetic flux changes. Question 5: V=−ΔphiM/ ΔT. This law states that the voltage in the wire is equal to the negative of the change in magnetic flux over time. The sign of the magnetic flux changes when the flux goes from increasing to decreasing, so the voltage and the current are reversed as well. Summary To sum everything up the lightbulbs current and flux depends on its positioning to the magnet. The magnetic flux increases as you approach the pole of the magnet. The sign of the magnetic flux changes when the flux goes from increasing to decreasing, so the voltage and the current are reversed as well. My hypothesis is partially accepted because even though the closer the lightbulb is to the magnet the flux may not the strongest because it depends on how many magnetic field lines are in the loop.