Online-Lab-8_Electromagnetic-Induction (1)

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PHYS 1402 Lab 8: Electromagnetic Induction Name: _____________________ Objectives  To observe the force exerted on a current carrying wire in a magnetic field.  To discover under what circumstances a magnetic field can induce a voltage in a coil of wire.  To relate the voltage and current induced in a coil of wire to the rate of change of magnetic flux passing through it.  To verify Faraday’s law of electromagnetic induction.  To verify Lenz’s law of electromagnetic induction. Marketable Skills: This course assesses the following Core Objectives. In this assignment, you will develop the following marketable skills: Critical Thinking  Analyze Issues  Anticipate problems, solutions, and consequences.  Apply knowledge to make decisions  Detect patterns/themes/underlying principles  Interpret data and synthesize information Communication  Summarize information  Use proper technical writing skills Personal Responsibility  Accept responsibility  Exhibit Time Management  Show attention to detail  Learn and grow from mistakes Empirical Quantitative  Communicate results using tables, charts, graphs  Contextualize numeric information/data  Demonstrate logical thinking  Draw inferences from data, use data to formulate conclusions  Use appropriate calculations to solve problems 1

Overview You will explore three phenomena in this lab: (1) the magnetic force exerted on a long straight current-carrying wire; (2) Faraday’s law of electromagnetic induction that describes how changing magnetic fields produce electric fields, emfs, and currents; and (3) Lenz’s law that describes the sense or direction of the emfs and currents produced by electromagnetic induction. Activity 1: Magnetic Force on Current-Carrying Wires Next, we will examine the effects of a magnetic field on a wire. You will watch the following video: https://dcccd.yuja.com/V/Video?v=988351&node=3897462&a=1186250782&autoplay=1 The switch is turned on and the current carrying wire is placed parallel to the magnetic poles. Question 1: Describe your observations. Question 2: If there is a force on the wire, note the direction of the force relative to the direction of the magnetic field. The switch is turned off. Magnet is rotated such that the current-carrying wire lies between the poles of the magnet. Question 3: What happens when there is a current flowing in the wire? Describe your observations. Question 4: If there is a force on the wire, note the direction of the force relative to the direction of the magnetic field and the current. Question 5: What happened when the current was reversed? Activity 2: Magnetic Field Download and run the simulation “Faraday’s Electromagnetic Lab”: https://phet.colorado.edu/sims/cheerpj/faraday/latest/faraday.html?simulation=faraday 2

Step 1: Notice the magnetic field lines, how they originate from the north pole and end on the south pole. Drag the compass around at different places near the magnet and notice the direction of the magnetic field there. Click on flip polarity and notice how the magnetic field lines change direction when the north pole becomes south and vice versa. Step 2: Move the compass to the side away from the bar magnet. Check the box next to “Show Field Sensor”. A magnetic field sensor will appear, displaying the average magnetic field B at that point where it is placed, along with the horizontal and vertical components B x and B y as well as the direction of the field vector relative to the bar magnet. Step 3: Drag the Field Meter with its cross hair at point A shown in the picture below. Record the magnetic field along with directions at this point, writing all values in the table on the next page. Step 4: Repeat Step 3 for points B, C, D, E, and F 3

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