Faradays Law

1667 WordsJul 4, 20157 Pages
LivePhoto Physics Activity 32 Name: Date: Exploring Faraday’s Law In 1820 Hans Christian Oersted observed that electric currents create magnetic fields. Consequently many scientists made unsuccessful attempts to create current in the presence of magnetic fields. After over 10 years of investigation Michael Faraday and Joseph Henry, working independently on different sides of the Atlantic, made the discovery that if a conducting coil has a changing magnetic flux passing through it an electromotive force is created that causes a current to flow through the coil. The equation describing this phenomenon quantitatively is known as Faraday’s Law. a b c In this activity you will be asked to use Faraday’s Law to explain why the…show more content…
The magnet is part way into the coil and its south pole is pulled out to the right +ive 3. When the north pole of the magnet moves part way into the coil to the left +ive 4. The magnet is part way in the coil and its north pole is pulled out to the right -ive : Increases Decreases Stays the same According to Faraday’s Law when will the measured emf induced in the coil be positive? When will it be negative? (Refer to Figure 2 and use + and – signs as appropriate) 2. Activity-Based Questions You have just started a new engineering job to help design a miniature generator. Your supervisor asks you to start by examining Logger Pro data she took as a rod shaped magnet was moved back and forth in a direction perpendicular to the coil shown in Figure 1. You begin by opening the <Samplemotion.cmbl> file. This Logger Pro file allows you to replay <SampleMotion.mov> that also includes a graph of the measured emf. Your boss had already taken video data of the rod’s motion in <SampleMotion.mov> to create a graph of the x-component of the rod’s leading edge and its velocity vs. time. You press the start button on the replay window to observe how the emf,  induced in the coil (monitored by a voltage sensor interfaced with a computer) changes over time. Think about how the relative velocities, polarity, and magnet flux that passes through the coil should affect the measured emf. (a) Your
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